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85b0edec46
It was transforming (x&y)==y to (x&y)!=0 in the case where y is variable and known to have at most one bit set (e.g. z&1). This is not correct; the expressions are not equivalent when y==0. I believe this patch salvages what can be salvaged, including all the cases in bt.ll. Dan, please review. Fixes gcc.c-torture/execute/20040709-[12].c git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64314 91177308-0d34-0410-b5e6-96231b3b80d8
71 lines
1.6 KiB
LLVM
71 lines
1.6 KiB
LLVM
; RUN: llvm-as < %s | llc -march=x86 | not grep btl
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; This tests some cases where BT must not be generated. See also bt.ll.
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; Fixes 20040709-[12].c in gcc testsuite.
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define void @test2(i32 %x, i32 %n) nounwind {
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entry:
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%tmp1 = and i32 %x, 1
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%tmp2 = urem i32 %tmp1, 15
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%tmp3 = and i32 %tmp2, 1 ; <i32> [#uses=1]
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%tmp4 = icmp eq i32 %tmp3, %tmp2 ; <i1> [#uses=1]
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br i1 %tmp4, label %bb, label %UnifiedReturnBlock
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bb: ; preds = %entry
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call void @foo()
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ret void
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UnifiedReturnBlock: ; preds = %entry
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ret void
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}
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define void @test3(i32 %x, i32 %n) nounwind {
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entry:
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%tmp1 = and i32 %x, 1
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%tmp2 = urem i32 %tmp1, 15
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%tmp3 = and i32 %tmp2, 1 ; <i32> [#uses=1]
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%tmp4 = icmp eq i32 %tmp2, %tmp3 ; <i1> [#uses=1]
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br i1 %tmp4, label %bb, label %UnifiedReturnBlock
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bb: ; preds = %entry
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call void @foo()
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ret void
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UnifiedReturnBlock: ; preds = %entry
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ret void
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}
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define void @test4(i32 %x, i32 %n) nounwind {
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entry:
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%tmp1 = and i32 %x, 1
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%tmp2 = urem i32 %tmp1, 15
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%tmp3 = and i32 %tmp2, 1 ; <i32> [#uses=1]
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%tmp4 = icmp ne i32 %tmp2, %tmp3 ; <i1> [#uses=1]
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br i1 %tmp4, label %bb, label %UnifiedReturnBlock
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bb: ; preds = %entry
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call void @foo()
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ret void
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UnifiedReturnBlock: ; preds = %entry
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ret void
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}
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define void @test5(i32 %x, i32 %n) nounwind {
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entry:
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%tmp1 = and i32 %x, 1
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%tmp2 = urem i32 %tmp1, 15
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%tmp3 = and i32 %tmp2, 1 ; <i32> [#uses=1]
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%tmp4 = icmp ne i32 %tmp2, %tmp3 ; <i1> [#uses=1]
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br i1 %tmp4, label %bb, label %UnifiedReturnBlock
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bb: ; preds = %entry
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call void @foo()
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ret void
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UnifiedReturnBlock: ; preds = %entry
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ret void
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}
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declare void @foo()
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