47 lines
1.3 KiB
LLVM
47 lines
1.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt -S -instcombine < %s | FileCheck %s
|
|
target datalayout = "E-m:e-i64:64-n32:64"
|
|
target triple = "powerpc64-unknown-linux-gnu"
|
|
|
|
@d = global i32 15, align 4
|
|
@b = global i32* @d, align 8
|
|
@a = common global i32 0, align 4
|
|
|
|
; Check that both InstCombine and InstSimplify can use computeKnownBits to
|
|
; realize that:
|
|
; ((2072 >> (L == 0)) >> 7) & 1
|
|
; is always zero.
|
|
define signext i32 @main() #1 {
|
|
; CHECK-LABEL: @main(
|
|
; CHECK-NEXT: entry:
|
|
; CHECK-NEXT: [[TMP0:%.*]] = load i32*, i32** @b, align 8
|
|
; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[TMP0]], align 4
|
|
; CHECK-NEXT: ret i32 [[TMP1]]
|
|
;
|
|
entry:
|
|
%0 = load i32*, i32** @b, align 8
|
|
%1 = load i32, i32* @a, align 4
|
|
%lnot = icmp eq i32 %1, 0
|
|
%lnot.ext = zext i1 %lnot to i32
|
|
%shr.i = lshr i32 2072, %lnot.ext
|
|
%call.lobit = lshr i32 %shr.i, 7
|
|
%2 = and i32 %call.lobit, 1
|
|
%3 = load i32, i32* %0, align 4
|
|
%or = or i32 %2, %3
|
|
store i32 %or, i32* %0, align 4
|
|
%4 = load i32, i32* @a, align 4
|
|
%lnot.1 = icmp eq i32 %4, 0
|
|
%lnot.ext.1 = zext i1 %lnot.1 to i32
|
|
%shr.i.1 = lshr i32 2072, %lnot.ext.1
|
|
%call.lobit.1 = lshr i32 %shr.i.1, 7
|
|
%5 = and i32 %call.lobit.1, 1
|
|
%or.1 = or i32 %5, %or
|
|
store i32 %or.1, i32* %0, align 4
|
|
ret i32 %or.1
|
|
|
|
}
|
|
|
|
attributes #0 = { nounwind readnone }
|
|
attributes #1 = { nounwind }
|
|
|