dfeb3991fb
It is now translated to `<1 x i64>`, which allows the removal of a bunch of special casing. This _incompatibly_ changes the ABI of any LLVM IR function with `x86_mmx` arguments or returns: instead of passing in mmx registers, they will now be passed via integer registers. However, the real-world incompatibility caused by this is expected to be minimal, because Clang never uses the x86_mmx type -- it lowers `__m64` to either `<1 x i64>` or `double`, depending on ABI. This change does _not_ eliminate the SelectionDAG `MVT::x86mmx` type. That type simply no longer corresponds to an IR type, and is used only by MMX intrinsics and inline-asm operands. Because SelectionDAGBuilder only knows how to generate the operands/results of intrinsics based on the IR type, it thus now generates the intrinsics with the type MVT::v1i64, instead of MVT::x86mmx. We need to fix this before the DAG LegalizeTypes, and thus have the X86 backend fix them up in DAGCombine. (This may be a short-lived hack, if all the MMX intrinsics can be removed in upcoming changes.) Works towards issue #98272.
124 lines
4.0 KiB
LLVM
124 lines
4.0 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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define double @a(<1 x i64> %y) {
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; CHECK-LABEL: @a(
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; CHECK-NEXT: [[BC:%.*]] = bitcast <1 x i64> [[Y:%.*]] to <1 x double>
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; CHECK-NEXT: [[C:%.*]] = extractelement <1 x double> [[BC]], i64 0
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; CHECK-NEXT: ret double [[C]]
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;
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%c = bitcast <1 x i64> %y to double
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ret double %c
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}
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define i64 @b(<1 x i64> %y) {
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; CHECK-LABEL: @b(
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; CHECK-NEXT: [[TMP1:%.*]] = extractelement <1 x i64> [[Y:%.*]], i64 0
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; CHECK-NEXT: ret i64 [[TMP1]]
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;
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%c = bitcast <1 x i64> %y to i64
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ret i64 %c
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}
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define <1 x i64> @c(double %y) {
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; CHECK-LABEL: @c(
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; CHECK-NEXT: [[C:%.*]] = bitcast double [[Y:%.*]] to <1 x i64>
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; CHECK-NEXT: ret <1 x i64> [[C]]
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;
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%c = bitcast double %y to <1 x i64>
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ret <1 x i64> %c
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}
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define <1 x i64> @d(i64 %y) {
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; CHECK-LABEL: @d(
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; CHECK-NEXT: [[C:%.*]] = insertelement <1 x i64> poison, i64 [[Y:%.*]], i64 0
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; CHECK-NEXT: ret <1 x i64> [[C]]
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;
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%c = bitcast i64 %y to <1 x i64>
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ret <1 x i64> %c
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}
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; FP source is ok.
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define <3 x i64> @bitcast_inselt_undef(double %x, i32 %idx) {
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; CHECK-LABEL: @bitcast_inselt_undef(
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; CHECK-NEXT: [[TMP1:%.*]] = insertelement <3 x double> undef, double [[X:%.*]], i32 [[IDX:%.*]]
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; CHECK-NEXT: [[I:%.*]] = bitcast <3 x double> [[TMP1]] to <3 x i64>
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; CHECK-NEXT: ret <3 x i64> [[I]]
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;
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%xb = bitcast double %x to i64
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%i = insertelement <3 x i64> undef, i64 %xb, i32 %idx
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ret <3 x i64> %i
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}
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; Integer source is ok; index is anything.
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define <3 x float> @bitcast_inselt_undef_fp(i32 %x, i567 %idx) {
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; CHECK-LABEL: @bitcast_inselt_undef_fp(
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; CHECK-NEXT: [[TMP1:%.*]] = insertelement <3 x i32> undef, i32 [[X:%.*]], i567 [[IDX:%.*]]
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; CHECK-NEXT: [[I:%.*]] = bitcast <3 x i32> [[TMP1]] to <3 x float>
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; CHECK-NEXT: ret <3 x float> [[I]]
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;
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%xb = bitcast i32 %x to float
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%i = insertelement <3 x float> undef, float %xb, i567 %idx
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ret <3 x float> %i
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}
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define <vscale x 3 x float> @bitcast_inselt_undef_vscale(i32 %x, i567 %idx) {
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; CHECK-LABEL: @bitcast_inselt_undef_vscale(
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; CHECK-NEXT: [[TMP1:%.*]] = insertelement <vscale x 3 x i32> undef, i32 [[X:%.*]], i567 [[IDX:%.*]]
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; CHECK-NEXT: [[I:%.*]] = bitcast <vscale x 3 x i32> [[TMP1]] to <vscale x 3 x float>
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; CHECK-NEXT: ret <vscale x 3 x float> [[I]]
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;
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%xb = bitcast i32 %x to float
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%i = insertelement <vscale x 3 x float> undef, float %xb, i567 %idx
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ret <vscale x 3 x float> %i
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}
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declare void @use(i64)
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; Negative test - extra use prevents canonicalization
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define <3 x i64> @bitcast_inselt_undef_extra_use(double %x, i32 %idx) {
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; CHECK-LABEL: @bitcast_inselt_undef_extra_use(
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; CHECK-NEXT: [[XB:%.*]] = bitcast double [[X:%.*]] to i64
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; CHECK-NEXT: call void @use(i64 [[XB]])
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; CHECK-NEXT: [[I:%.*]] = insertelement <3 x i64> undef, i64 [[XB]], i32 [[IDX:%.*]]
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; CHECK-NEXT: ret <3 x i64> [[I]]
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;
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%xb = bitcast double %x to i64
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call void @use(i64 %xb)
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%i = insertelement <3 x i64> undef, i64 %xb, i32 %idx
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ret <3 x i64> %i
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}
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; Negative test - source type must be scalar
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define <3 x i64> @bitcast_inselt_undef_vec_src(<2 x i32> %x, i32 %idx) {
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; CHECK-LABEL: @bitcast_inselt_undef_vec_src(
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; CHECK-NEXT: [[XB:%.*]] = bitcast <2 x i32> [[X:%.*]] to i64
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; CHECK-NEXT: [[I:%.*]] = insertelement <3 x i64> undef, i64 [[XB]], i32 [[IDX:%.*]]
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; CHECK-NEXT: ret <3 x i64> [[I]]
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;
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%xb = bitcast <2 x i32> %x to i64
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%i = insertelement <3 x i64> undef, i64 %xb, i32 %idx
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ret <3 x i64> %i
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}
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; Reduce number of casts
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define <2 x i64> @PR45748(double %x, double %y) {
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; CHECK-LABEL: @PR45748(
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; CHECK-NEXT: [[TMP1:%.*]] = insertelement <2 x double> poison, double [[X:%.*]], i64 0
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; CHECK-NEXT: [[TMP2:%.*]] = insertelement <2 x double> [[TMP1]], double [[Y:%.*]], i64 1
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; CHECK-NEXT: [[I1:%.*]] = bitcast <2 x double> [[TMP2]] to <2 x i64>
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; CHECK-NEXT: ret <2 x i64> [[I1]]
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;
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%xb = bitcast double %x to i64
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%i0 = insertelement <2 x i64> undef, i64 %xb, i32 0
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%yb = bitcast double %y to i64
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%i1 = insertelement <2 x i64> %i0, i64 %yb, i32 1
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ret <2 x i64> %i1
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}
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