251377c47d
#121386 Introduced cttz intrinsics which caused a regression where vscale/vscale divisions could no longer be constant folded. This fold was suggested as a fix in #126411. https://alive2.llvm.org/ce/z/gWbtPw
137 lines
4.2 KiB
LLVM
137 lines
4.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt < %s -passes=instcombine -S | FileCheck %s
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define i32 @shl_cttz_false(i32 %x, i32 %y) {
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; CHECK-LABEL: define i32 @shl_cttz_false(
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; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CTTZ:%.*]] = call range(i32 0, 33) i32 @llvm.cttz.i32(i32 [[Y]], i1 true)
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; CHECK-NEXT: [[RES:%.*]] = shl i32 [[X]], [[CTTZ]]
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; CHECK-NEXT: ret i32 [[RES]]
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;
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entry:
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%cttz = call i32 @llvm.cttz.i32(i32 %y, i1 false)
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%res = shl i32 %x, %cttz
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ret i32 %res
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}
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; Make sure that noundef is dropped.
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define i32 @shl_cttz_false_noundef(i32 %x, i32 %y) {
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; CHECK-LABEL: define i32 @shl_cttz_false_noundef(
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; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CTTZ:%.*]] = call range(i32 0, 33) i32 @llvm.cttz.i32(i32 [[Y]], i1 true)
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; CHECK-NEXT: [[RES:%.*]] = shl i32 [[X]], [[CTTZ]]
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; CHECK-NEXT: ret i32 [[RES]]
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;
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entry:
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%cttz = call noundef i32 @llvm.cttz.i32(i32 %y, i1 false)
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%res = shl i32 %x, %cttz
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ret i32 %res
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}
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define i32 @shl_ctlz_false(i32 %x, i32 %y) {
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; CHECK-LABEL: define i32 @shl_ctlz_false(
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; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CTTZ:%.*]] = call range(i32 0, 33) i32 @llvm.ctlz.i32(i32 [[Y]], i1 true)
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; CHECK-NEXT: [[RES:%.*]] = shl i32 [[X]], [[CTTZ]]
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; CHECK-NEXT: ret i32 [[RES]]
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;
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entry:
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%cttz = call i32 @llvm.ctlz.i32(i32 %y, i1 false)
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%res = shl i32 %x, %cttz
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ret i32 %res
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}
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define i32 @lshr_cttz_false(i32 %x, i32 %y) {
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; CHECK-LABEL: define i32 @lshr_cttz_false(
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; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CTTZ:%.*]] = call range(i32 0, 33) i32 @llvm.cttz.i32(i32 [[Y]], i1 true)
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; CHECK-NEXT: [[RES:%.*]] = lshr i32 [[X]], [[CTTZ]]
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; CHECK-NEXT: ret i32 [[RES]]
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;
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entry:
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%cttz = call i32 @llvm.cttz.i32(i32 %y, i1 false)
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%res = lshr i32 %x, %cttz
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ret i32 %res
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}
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define i32 @ashr_cttz_false(i32 %x, i32 %y) {
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; CHECK-LABEL: define i32 @ashr_cttz_false(
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; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CTTZ:%.*]] = call range(i32 0, 33) i32 @llvm.cttz.i32(i32 [[Y]], i1 true)
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; CHECK-NEXT: [[RES:%.*]] = ashr i32 [[X]], [[CTTZ]]
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; CHECK-NEXT: ret i32 [[RES]]
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;
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entry:
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%cttz = call i32 @llvm.cttz.i32(i32 %y, i1 false)
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%res = ashr i32 %x, %cttz
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ret i32 %res
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}
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define i32 @shl_cttz_false_multiuse(i32 %x, i32 %y) {
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; CHECK-LABEL: define i32 @shl_cttz_false_multiuse(
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; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CTTZ:%.*]] = call range(i32 0, 33) i32 @llvm.cttz.i32(i32 [[Y]], i1 false)
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; CHECK-NEXT: call void @use(i32 [[CTTZ]])
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; CHECK-NEXT: [[RES:%.*]] = shl i32 [[X]], [[CTTZ]]
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; CHECK-NEXT: ret i32 [[RES]]
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;
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entry:
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%cttz = call i32 @llvm.cttz.i32(i32 %y, i1 false)
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call void @use(i32 %cttz)
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%res = shl i32 %x, %cttz
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ret i32 %res
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}
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define i32 @shl_cttz_as_lhs(i32 %x, i32 %y) {
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; CHECK-LABEL: define i32 @shl_cttz_as_lhs(
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; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[CTTZ:%.*]] = call range(i32 0, 33) i32 @llvm.cttz.i32(i32 [[Y]], i1 false)
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; CHECK-NEXT: [[RES:%.*]] = shl i32 [[CTTZ]], [[X]]
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; CHECK-NEXT: ret i32 [[RES]]
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;
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entry:
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%cttz = call i32 @llvm.cttz.i32(i32 %y, i1 false)
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%res = shl i32 %cttz, %x
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ret i32 %res
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}
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define i64 @fold_cttz_64() vscale_range(1,16) {
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; CHECK-LABEL: define i64 @fold_cttz_64(
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; CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i64 4
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;
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entry:
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%vscale = tail call i64 @llvm.vscale.i64()
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%shl0 = shl nuw nsw i64 %vscale, 4
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%shl1 = shl nuw nsw i64 %vscale, 2
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%cttz = tail call range(i64 2, 65) i64 @llvm.cttz.i64(i64 %shl1, i1 true)
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%div1 = lshr i64 %shl0, %cttz
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ret i64 %div1
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}
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define i32 @fold_cttz_32() vscale_range(1,16) {
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; CHECK-LABEL: define i32 @fold_cttz_32(
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; CHECK-SAME: ) #[[ATTR0]] {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: ret i32 4
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;
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entry:
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%vscale = tail call i32 @llvm.vscale.i32()
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%shl0 = shl nuw nsw i32 %vscale, 4
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%shl1 = shl nuw nsw i32 %vscale, 2
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%cttz = tail call range(i32 2, 65) i32 @llvm.cttz.i32(i32 %shl1, i1 true)
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%div1 = lshr i32 %shl0, %cttz
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ret i32 %div1
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}
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declare void @use(i32)
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