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66f66627ed
If a function is known to return one of its arguments, we can use that in order to compute known bits of the return value. Differential Revision: http://reviews.llvm.org/D9397 llvm-svn: 275036
29 lines
618 B
LLVM
29 lines
618 B
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: nounwind uwtable
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define i32 @foo1(i32* align 32 %a) #0 {
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entry:
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%0 = load i32, i32* %a, align 4
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ret i32 %0
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; CHECK-LABEL: @foo1
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; CHECK-DAG: load i32, i32* %a, align 32
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; CHECK: ret i32
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}
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define i32 @foo2(i32* align 32 %a) #0 {
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entry:
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%v = call i32* @func1(i32* %a)
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%0 = load i32, i32* %v, align 4
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ret i32 %0
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; CHECK-LABEL: @foo2
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; CHECK-DAG: load i32, i32* %v, align 32
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; CHECK: ret i32
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}
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declare i32* @func1(i32* returned) nounwind
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