30 lines
849 B
LLVM
30 lines
849 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -O3 -S < %s | FileCheck %s
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; RUN: opt -passes='default<O3>' -S < %s | FileCheck %s
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; This should become a single funnel shift through a combination
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; of aggressive-instcombine, simplifycfg, and instcombine.
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; https://bugs.llvm.org/show_bug.cgi?id=34924
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define i32 @rotl(i32 %a, i32 %b) {
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; CHECK-LABEL: @rotl(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[COND:%.*]] = tail call i32 @llvm.fshl.i32(i32 [[A:%.*]], i32 [[A]], i32 [[B:%.*]])
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; CHECK-NEXT: ret i32 [[COND]]
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;
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entry:
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%cmp = icmp eq i32 %b, 0
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br i1 %cmp, label %end, label %rotbb
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rotbb:
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%sub = sub i32 32, %b
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%shr = lshr i32 %a, %sub
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%shl = shl i32 %a, %b
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%or = or i32 %shr, %shl
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br label %end
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end:
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%cond = phi i32 [ %or, %rotbb ], [ %a, %entry ]
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ret i32 %cond
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}
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