5d2fc9408e
InstCombine phi scalarization would always create a new binary op with the phi as the first operand, which is not correct for non-commutable binary ops such as sub. This fix preserves the original binary op ordering in the new binary op and adds a test for this behavior. Currently, this transformation can produce silently incorrect IR, and in the case of the added test, would optimize it out entirely.
442 lines
16 KiB
LLVM
442 lines
16 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -passes=instcombine -S < %s | FileCheck %s
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define i32 @extract_load(ptr %p) {
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;
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; CHECK-LABEL: @extract_load(
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; CHECK-NEXT: [[X:%.*]] = load <4 x i32>, ptr [[P:%.*]], align 4
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; CHECK-NEXT: [[EXT:%.*]] = extractelement <4 x i32> [[X]], i64 1
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; CHECK-NEXT: ret i32 [[EXT]]
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;
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%x = load <4 x i32>, ptr %p, align 4
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%ext = extractelement <4 x i32> %x, i32 1
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ret i32 %ext
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}
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define double @extract_load_fp(ptr %p) {
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;
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; CHECK-LABEL: @extract_load_fp(
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; CHECK-NEXT: [[X:%.*]] = load <4 x double>, ptr [[P:%.*]], align 32
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; CHECK-NEXT: [[EXT:%.*]] = extractelement <4 x double> [[X]], i64 3
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; CHECK-NEXT: ret double [[EXT]]
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;
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%x = load <4 x double>, ptr %p, align 32
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%ext = extractelement <4 x double> %x, i32 3
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ret double %ext
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}
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define double @extract_load_volatile(ptr %p) {
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;
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; CHECK-LABEL: @extract_load_volatile(
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; CHECK-NEXT: [[X:%.*]] = load volatile <4 x double>, ptr [[P:%.*]], align 32
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; CHECK-NEXT: [[EXT:%.*]] = extractelement <4 x double> [[X]], i64 2
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; CHECK-NEXT: ret double [[EXT]]
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;
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%x = load volatile <4 x double>, ptr %p
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%ext = extractelement <4 x double> %x, i32 2
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ret double %ext
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}
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define double @extract_load_extra_use(ptr %p, ptr %p2) {
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;
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; CHECK-LABEL: @extract_load_extra_use(
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; CHECK-NEXT: [[X:%.*]] = load <4 x double>, ptr [[P:%.*]], align 8
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; CHECK-NEXT: [[EXT:%.*]] = extractelement <4 x double> [[X]], i64 0
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; CHECK-NEXT: store <4 x double> [[X]], ptr [[P2:%.*]], align 32
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; CHECK-NEXT: ret double [[EXT]]
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;
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%x = load <4 x double>, ptr %p, align 8
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%ext = extractelement <4 x double> %x, i32 0
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store <4 x double> %x, ptr %p2
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ret double %ext
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}
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define double @extract_load_variable_index(ptr %p, i32 %y) {
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;
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; CHECK-LABEL: @extract_load_variable_index(
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; CHECK-NEXT: [[X:%.*]] = load <4 x double>, ptr [[P:%.*]], align 32
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; CHECK-NEXT: [[EXT:%.*]] = extractelement <4 x double> [[X]], i32 [[Y:%.*]]
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; CHECK-NEXT: ret double [[EXT]]
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;
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%x = load <4 x double>, ptr %p
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%ext = extractelement <4 x double> %x, i32 %y
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ret double %ext
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}
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define void @scalarize_phi(ptr %n, ptr %inout) {
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;
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; CHECK-LABEL: @scalarize_phi(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[T0:%.*]] = load volatile float, ptr [[INOUT:%.*]], align 4
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; CHECK-NEXT: br label [[FOR_COND:%.*]]
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; CHECK: for.cond:
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; CHECK-NEXT: [[TMP0:%.*]] = phi float [ [[T0]], [[ENTRY:%.*]] ], [ [[TMP1:%.*]], [[FOR_BODY:%.*]] ]
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; CHECK-NEXT: [[I_0:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[INC:%.*]], [[FOR_BODY]] ]
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; CHECK-NEXT: [[T1:%.*]] = load i32, ptr [[N:%.*]], align 4
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; CHECK-NEXT: [[CMP_NOT:%.*]] = icmp eq i32 [[I_0]], [[T1]]
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; CHECK-NEXT: br i1 [[CMP_NOT]], label [[FOR_END:%.*]], label [[FOR_BODY]]
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; CHECK: for.body:
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; CHECK-NEXT: store volatile float [[TMP0]], ptr [[INOUT]], align 4
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; CHECK-NEXT: [[TMP1]] = fmul float [[TMP0]], 0x4002A3D700000000
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; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I_0]], 1
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; CHECK-NEXT: br label [[FOR_COND]]
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; CHECK: for.end:
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; CHECK-NEXT: ret void
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;
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entry:
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%t0 = load volatile float, ptr %inout, align 4
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%insert = insertelement <4 x float> undef, float %t0, i32 0
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%splat = shufflevector <4 x float> %insert, <4 x float> undef, <4 x i32> zeroinitializer
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%insert1 = insertelement <4 x float> undef, float 3.0, i32 0
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br label %for.cond
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for.cond:
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%x.0 = phi <4 x float> [ %splat, %entry ], [ %mul, %for.body ]
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%t1 = load i32, ptr %n, align 4
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%cmp = icmp ne i32 %i.0, %t1
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br i1 %cmp, label %for.body, label %for.end
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for.body:
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%t2 = extractelement <4 x float> %x.0, i32 1
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store volatile float %t2, ptr %inout, align 4
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%mul = fmul <4 x float> %x.0, <float 0x4002A3D700000000, float 0x4002A3D700000000, float 0x4002A3D700000000, float 0x4002A3D700000000>
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%inc = add nsw i32 %i.0, 1
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br label %for.cond
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for.end:
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ret void
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}
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define void @scalarize_phi_sub(ptr %n, ptr %inout) {
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;
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; CHECK-LABEL: @scalarize_phi_sub(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[T0:%.*]] = load volatile float, ptr [[INOUT:%.*]], align 4
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; CHECK-NEXT: br label [[FOR_COND:%.*]]
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; CHECK: for.cond:
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; CHECK-NEXT: [[TMP0:%.*]] = phi float [ [[T0]], [[ENTRY:%.*]] ], [ [[TMP1:%.*]], [[FOR_BODY:%.*]] ]
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; CHECK-NEXT: [[I_0:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[INC:%.*]], [[FOR_BODY]] ]
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; CHECK-NEXT: [[T1:%.*]] = load i32, ptr [[N:%.*]], align 4
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; CHECK-NEXT: [[CMP_NOT:%.*]] = icmp eq i32 [[I_0]], [[T1]]
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; CHECK-NEXT: br i1 [[CMP_NOT]], label [[FOR_END:%.*]], label [[FOR_BODY]]
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; CHECK: for.body:
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; CHECK-NEXT: store volatile float [[TMP0]], ptr [[INOUT]], align 4
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; CHECK-NEXT: [[TMP1]] = fsub float 0.000000e+00, [[TMP0]]
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; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[I_0]], 1
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; CHECK-NEXT: br label [[FOR_COND]]
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; CHECK: for.end:
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; CHECK-NEXT: ret void
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;
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entry:
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%t0 = load volatile float, ptr %inout, align 4
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%insert = insertelement <4 x float> poison, float %t0, i32 0
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%splat = shufflevector <4 x float> %insert, <4 x float> poison, <4 x i32> zeroinitializer
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br label %for.cond
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for.cond:
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%x.0 = phi <4 x float> [ %splat, %entry ], [ %sub, %for.body ]
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%i.0 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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%t1 = load i32, ptr %n, align 4
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%cmp = icmp ne i32 %i.0, %t1
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br i1 %cmp, label %for.body, label %for.end
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for.body:
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%t2 = extractelement <4 x float> %x.0, i32 1
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store volatile float %t2, ptr %inout, align 4
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%sub = fsub <4 x float> zeroinitializer, %x.0
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%inc = add nsw i32 %i.0, 1
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br label %for.cond
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for.end:
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ret void
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}
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define float @extract_element_binop_splat_constant_index(<4 x float> %x) {
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;
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; CHECK-LABEL: @extract_element_binop_splat_constant_index(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x float> [[X:%.*]], i64 2
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; CHECK-NEXT: [[R:%.*]] = fadd float [[TMP1]], 0x4002A3D700000000
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; CHECK-NEXT: ret float [[R]]
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;
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%b = fadd <4 x float> %x, <float 0x4002A3D700000000, float 0x4002A3D700000000, float 0x4002A3D700000000, float 0x4002A3D700000000>
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%r = extractelement <4 x float> %b, i32 2
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ret float %r
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}
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define double @extract_element_binop_splat_with_undef_constant_index(<2 x double> %x) {
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;
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; CHECK-LABEL: @extract_element_binop_splat_with_undef_constant_index(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x double> [[X:%.*]], i64 0
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; CHECK-NEXT: [[R:%.*]] = fdiv double 4.200000e+01, [[TMP1]]
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; CHECK-NEXT: ret double [[R]]
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;
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%b = fdiv <2 x double> <double 42.0, double undef>, %x
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%r = extractelement <2 x double> %b, i32 0
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ret double %r
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}
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define float @extract_element_binop_nonsplat_constant_index(<2 x float> %x) {
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;
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; CHECK-LABEL: @extract_element_binop_nonsplat_constant_index(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x float> [[X:%.*]], i64 1
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; CHECK-NEXT: [[R:%.*]] = fmul float [[TMP1]], 4.300000e+01
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; CHECK-NEXT: ret float [[R]]
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;
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%b = fmul <2 x float> %x, <float 42.0, float 43.0>
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%r = extractelement <2 x float> %b, i32 1
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ret float %r
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}
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define i8 @extract_element_binop_splat_variable_index(<4 x i8> %x, i32 %y) {
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;
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; CHECK-LABEL: @extract_element_binop_splat_variable_index(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x i8> [[X:%.*]], i32 [[Y:%.*]]
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; CHECK-NEXT: [[R:%.*]] = sdiv i8 [[TMP1]], 42
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; CHECK-NEXT: ret i8 [[R]]
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;
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%b = sdiv <4 x i8> %x, <i8 42, i8 42, i8 42, i8 42>
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%r = extractelement <4 x i8> %b, i32 %y
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ret i8 %r
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}
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; We cannot move the extractelement before the sdiv here, because %z may be
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; out of range, making the divisor poison and resulting in immediate UB.
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define i8 @extract_element_binop_splat_variable_index_may_trap(<4 x i8> %x, <4 x i8> %y, i32 %z) {
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;
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; CHECK-LABEL: @extract_element_binop_splat_variable_index_may_trap(
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; CHECK-NEXT: [[B:%.*]] = sdiv <4 x i8> splat (i8 42), [[Y:%.*]]
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; CHECK-NEXT: [[R:%.*]] = extractelement <4 x i8> [[B]], i32 [[Z:%.*]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%b = sdiv <4 x i8> splat (i8 42), %y
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%r = extractelement <4 x i8> %b, i32 %z
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ret i8 %r
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}
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; Moving the extractelement first is fine here, because the index is known to
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; be valid, so we can't introduce additional poison.
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define i8 @extract_element_binop_constant_index_may_trap(<4 x i8> %x, <4 x i8> %y, i32 %z) {
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;
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; CHECK-LABEL: @extract_element_binop_constant_index_may_trap(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x i8> [[Y:%.*]], i64 3
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; CHECK-NEXT: [[R:%.*]] = sdiv i8 42, [[TMP1]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%b = sdiv <4 x i8> splat (i8 42), %y
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%r = extractelement <4 x i8> %b, i32 3
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ret i8 %r
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}
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define i8 @extract_element_binop_splat_with_undef_variable_index(<4 x i8> %x, i32 %y) {
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;
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; CHECK-LABEL: @extract_element_binop_splat_with_undef_variable_index(
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; CHECK-NEXT: [[B:%.*]] = mul <4 x i8> [[X:%.*]], <i8 42, i8 42, i8 undef, i8 42>
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; CHECK-NEXT: [[R:%.*]] = extractelement <4 x i8> [[B]], i32 [[Y:%.*]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%b = mul <4 x i8> %x, <i8 42, i8 42, i8 undef, i8 42>
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%r = extractelement <4 x i8> %b, i32 %y
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ret i8 %r
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}
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define i8 @extract_element_binop_nonsplat_variable_index(<4 x i8> %x, i32 %y) {
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;
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; CHECK-LABEL: @extract_element_binop_nonsplat_variable_index(
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; CHECK-NEXT: [[B:%.*]] = lshr <4 x i8> [[X:%.*]], <i8 4, i8 3, i8 undef, i8 2>
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; CHECK-NEXT: [[R:%.*]] = extractelement <4 x i8> [[B]], i32 [[Y:%.*]]
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; CHECK-NEXT: ret i8 [[R]]
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;
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%b = lshr <4 x i8> %x, <i8 4, i8 3, i8 undef, i8 2>
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%r = extractelement <4 x i8> %b, i32 %y
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ret i8 %r
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}
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define float @extract_element_load(<4 x float> %x, ptr %ptr) {
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;
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; CHECK-LABEL: @extract_element_load(
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; CHECK-NEXT: [[LOAD:%.*]] = load <4 x float>, ptr [[PTR:%.*]], align 16
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x float> [[X:%.*]], i64 2
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; CHECK-NEXT: [[TMP2:%.*]] = extractelement <4 x float> [[LOAD]], i64 2
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; CHECK-NEXT: [[R:%.*]] = fadd float [[TMP1]], [[TMP2]]
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; CHECK-NEXT: ret float [[R]]
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;
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%load = load <4 x float>, ptr %ptr
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%add = fadd <4 x float> %x, %load
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%r = extractelement <4 x float> %add, i32 2
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ret float %r
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}
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define float @extract_element_multi_Use_load(<4 x float> %x, ptr %ptr0, ptr %ptr1) {
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;
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; CHECK-LABEL: @extract_element_multi_Use_load(
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; CHECK-NEXT: [[LOAD:%.*]] = load <4 x float>, ptr [[PTR0:%.*]], align 16
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; CHECK-NEXT: store <4 x float> [[LOAD]], ptr [[PTR1:%.*]], align 16
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; CHECK-NEXT: [[ADD:%.*]] = fadd <4 x float> [[X:%.*]], [[LOAD]]
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; CHECK-NEXT: [[R:%.*]] = extractelement <4 x float> [[ADD]], i64 2
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; CHECK-NEXT: ret float [[R]]
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;
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%load = load <4 x float>, ptr %ptr0
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store <4 x float> %load, ptr %ptr1
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%add = fadd <4 x float> %x, %load
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%r = extractelement <4 x float> %add, i32 2
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ret float %r
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}
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define float @extract_element_variable_index(<4 x float> %x, i32 %y) {
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;
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; CHECK-LABEL: @extract_element_variable_index(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x float> [[X:%.*]], i32 [[Y:%.*]]
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; CHECK-NEXT: [[R:%.*]] = fadd float [[TMP1]], 1.000000e+00
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; CHECK-NEXT: ret float [[R]]
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;
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%add = fadd <4 x float> %x, <float 1.0, float 1.0, float 1.0, float 1.0>
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%r = extractelement <4 x float> %add, i32 %y
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ret float %r
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}
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define float @extelt_binop_insertelt(<4 x float> %A, <4 x float> %B, float %f) {
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;
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; CHECK-LABEL: @extelt_binop_insertelt(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x float> [[B:%.*]], i64 0
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; CHECK-NEXT: [[E:%.*]] = fmul nnan float [[F:%.*]], [[TMP1]]
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; CHECK-NEXT: ret float [[E]]
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;
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%C = insertelement <4 x float> %A, float %f, i32 0
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%D = fmul nnan <4 x float> %C, %B
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%E = extractelement <4 x float> %D, i32 0
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ret float %E
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}
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; We recurse to find a scalarizable operand.
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define i32 @extelt_binop_binop_insertelt(<4 x i32> %A, <4 x i32> %B, i32 %f) {
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;
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; CHECK-LABEL: @extelt_binop_binop_insertelt(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x i32> [[B:%.*]], i64 0
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; CHECK-NEXT: [[TMP2:%.*]] = add i32 [[F:%.*]], [[TMP1]]
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; CHECK-NEXT: [[TMP3:%.*]] = extractelement <4 x i32> [[B]], i64 0
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; CHECK-NEXT: [[E:%.*]] = mul nsw i32 [[TMP2]], [[TMP3]]
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; CHECK-NEXT: ret i32 [[E]]
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;
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%v = insertelement <4 x i32> %A, i32 %f, i32 0
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%C = add <4 x i32> %v, %B
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%D = mul nsw <4 x i32> %C, %B
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%E = extractelement <4 x i32> %D, i32 0
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ret i32 %E
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}
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define float @extract_element_constant_vector_variable_index(i32 %y) {
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;
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; CHECK-LABEL: @extract_element_constant_vector_variable_index(
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; CHECK-NEXT: [[R:%.*]] = extractelement <4 x float> <float 1.000000e+00, float 2.000000e+00, float 3.000000e+00, float 4.000000e+00>, i32 [[Y:%.*]]
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; CHECK-NEXT: ret float [[R]]
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;
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%r = extractelement <4 x float> <float 1.0, float 2.0, float 3.0, float 4.0>, i32 %y
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ret float %r
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}
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define i1 @cheap_to_extract_icmp(<4 x i32> %x, <4 x i1> %y) {
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;
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; CHECK-LABEL: @cheap_to_extract_icmp(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x i32> [[X:%.*]], i64 2
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; CHECK-NEXT: [[TMP2:%.*]] = icmp eq i32 [[TMP1]], 0
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; CHECK-NEXT: [[TMP3:%.*]] = extractelement <4 x i1> [[Y:%.*]], i64 2
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; CHECK-NEXT: [[R:%.*]] = and i1 [[TMP2]], [[TMP3]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%cmp = icmp eq <4 x i32> %x, zeroinitializer
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%and = and <4 x i1> %cmp, %y
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%r = extractelement <4 x i1> %and, i32 2
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ret i1 %r
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}
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define i1 @cheap_to_extract_fcmp(<4 x float> %x, <4 x i1> %y) {
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;
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; CHECK-LABEL: @cheap_to_extract_fcmp(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x float> [[X:%.*]], i64 2
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; CHECK-NEXT: [[TMP2:%.*]] = fcmp oeq float [[TMP1]], 0.000000e+00
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; CHECK-NEXT: [[TMP3:%.*]] = extractelement <4 x i1> [[Y:%.*]], i64 2
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; CHECK-NEXT: [[R:%.*]] = and i1 [[TMP2]], [[TMP3]]
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; CHECK-NEXT: ret i1 [[R]]
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;
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%cmp = fcmp oeq <4 x float> %x, zeroinitializer
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%and = and <4 x i1> %cmp, %y
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%r = extractelement <4 x i1> %and, i32 2
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ret i1 %r
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}
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define i1 @extractelt_vector_icmp_constrhs(<2 x i32> %arg) {
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;
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; CHECK-LABEL: @extractelt_vector_icmp_constrhs(
|
|
; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x i32> [[ARG:%.*]], i64 0
|
|
; CHECK-NEXT: [[EXT:%.*]] = icmp eq i32 [[TMP1]], 0
|
|
; CHECK-NEXT: ret i1 [[EXT]]
|
|
;
|
|
%cmp = icmp eq <2 x i32> %arg, zeroinitializer
|
|
%ext = extractelement <2 x i1> %cmp, i32 0
|
|
ret i1 %ext
|
|
}
|
|
|
|
define i1 @extractelt_vector_fcmp_constrhs(<2 x float> %arg) {
|
|
;
|
|
; CHECK-LABEL: @extractelt_vector_fcmp_constrhs(
|
|
; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x float> [[ARG:%.*]], i64 0
|
|
; CHECK-NEXT: [[EXT:%.*]] = fcmp oeq float [[TMP1]], 0.000000e+00
|
|
; CHECK-NEXT: ret i1 [[EXT]]
|
|
;
|
|
%cmp = fcmp oeq <2 x float> %arg, zeroinitializer
|
|
%ext = extractelement <2 x i1> %cmp, i32 0
|
|
ret i1 %ext
|
|
}
|
|
|
|
define i1 @extractelt_vector_icmp_constrhs_dynidx(<2 x i32> %arg, i32 %idx) {
|
|
;
|
|
; CHECK-LABEL: @extractelt_vector_icmp_constrhs_dynidx(
|
|
; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x i32> [[ARG:%.*]], i32 [[IDX:%.*]]
|
|
; CHECK-NEXT: [[EXT:%.*]] = icmp eq i32 [[TMP1]], 0
|
|
; CHECK-NEXT: ret i1 [[EXT]]
|
|
;
|
|
%cmp = icmp eq <2 x i32> %arg, zeroinitializer
|
|
%ext = extractelement <2 x i1> %cmp, i32 %idx
|
|
ret i1 %ext
|
|
}
|
|
|
|
define i1 @extractelt_vector_fcmp_constrhs_dynidx(<2 x float> %arg, i32 %idx) {
|
|
;
|
|
; CHECK-LABEL: @extractelt_vector_fcmp_constrhs_dynidx(
|
|
; CHECK-NEXT: [[TMP1:%.*]] = extractelement <2 x float> [[ARG:%.*]], i32 [[IDX:%.*]]
|
|
; CHECK-NEXT: [[EXT:%.*]] = fcmp oeq float [[TMP1]], 0.000000e+00
|
|
; CHECK-NEXT: ret i1 [[EXT]]
|
|
;
|
|
%cmp = fcmp oeq <2 x float> %arg, zeroinitializer
|
|
%ext = extractelement <2 x i1> %cmp, i32 %idx
|
|
ret i1 %ext
|
|
}
|
|
|
|
define i1 @extractelt_vector_fcmp_copy_flags(<4 x float> %x) {
|
|
; CHECK-LABEL: @extractelt_vector_fcmp_copy_flags(
|
|
; CHECK-NEXT: [[TMP1:%.*]] = extractelement <4 x float> [[X:%.*]], i64 2
|
|
; CHECK-NEXT: [[R:%.*]] = fcmp nsz arcp oeq float [[TMP1]], 0.000000e+00
|
|
; CHECK-NEXT: ret i1 [[R]]
|
|
;
|
|
%cmp = fcmp nsz arcp oeq <4 x float> %x, zeroinitializer
|
|
%r = extractelement <4 x i1> %cmp, i32 2
|
|
ret i1 %r
|
|
}
|
|
|
|
define i1 @extractelt_vector_fcmp_not_cheap_to_scalarize_multi_use(<2 x float> %arg0, <2 x float> %arg1, <2 x float> %arg2, i32 %idx) {
|
|
;
|
|
; CHECK-LABEL: @extractelt_vector_fcmp_not_cheap_to_scalarize_multi_use(
|
|
; CHECK-NEXT: [[ADD:%.*]] = fadd <2 x float> [[ARG1:%.*]], [[ARG2:%.*]]
|
|
; CHECK-NEXT: store volatile <2 x float> [[ADD]], ptr undef, align 8
|
|
; CHECK-NEXT: [[CMP:%.*]] = fcmp oeq <2 x float> [[ARG0:%.*]], [[ADD]]
|
|
; CHECK-NEXT: [[EXT:%.*]] = extractelement <2 x i1> [[CMP]], i64 0
|
|
; CHECK-NEXT: ret i1 [[EXT]]
|
|
;
|
|
%add = fadd <2 x float> %arg1, %arg2
|
|
store volatile <2 x float> %add, ptr undef
|
|
%cmp = fcmp oeq <2 x float> %arg0, %add
|
|
%ext = extractelement <2 x i1> %cmp, i32 0
|
|
ret i1 %ext
|
|
}
|