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llvm-project/llvm/test/CodeGen/X86/nobt.ll

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X86: Do not use llc -march in tests. `llc -march` is problematic because it only switches the target architecture, but leaves the operating system unchanged. This occasionally leads to indeterministic tests because the OS from LLVM_DEFAULT_TARGET_TRIPLE is used. However we can simply always use `llc -mtriple` instead. This changes all the tests to do this to avoid people using -march when they copy and paste parts of tests. See also the discussion in https://reviews.llvm.org/D35287 llvm-svn: 309774
2017-08-02 08:28:10 +08:00
; RUN: llc < %s -mtriple=i686-- | not grep btl
Make a transformation added in 63266 a bit less aggressive. 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 llvm-svn: 64314
2009-02-12 03:19:41 +08:00
; This tests some cases where BT must not be generated. See also bt.ll.
; Fixes 20040709-[12].c in gcc testsuite.
define void @test2(i32 %x, i32 %n) nounwind {
entry:
%tmp1 = and i32 %x, 1
%tmp2 = urem i32 %tmp1, 15
%tmp3 = and i32 %tmp2, 1 ; <i32> [#uses=1]
%tmp4 = icmp eq i32 %tmp3, %tmp2 ; <i1> [#uses=1]
br i1 %tmp4, label %bb, label %UnifiedReturnBlock
bb: ; preds = %entry
call void @foo()
ret void
UnifiedReturnBlock: ; preds = %entry
ret void
}
define void @test3(i32 %x, i32 %n) nounwind {
entry:
%tmp1 = and i32 %x, 1
%tmp2 = urem i32 %tmp1, 15
%tmp3 = and i32 %tmp2, 1 ; <i32> [#uses=1]
%tmp4 = icmp eq i32 %tmp2, %tmp3 ; <i1> [#uses=1]
br i1 %tmp4, label %bb, label %UnifiedReturnBlock
bb: ; preds = %entry
call void @foo()
ret void
UnifiedReturnBlock: ; preds = %entry
ret void
}
define void @test4(i32 %x, i32 %n) nounwind {
entry:
%tmp1 = and i32 %x, 1
%tmp2 = urem i32 %tmp1, 15
%tmp3 = and i32 %tmp2, 1 ; <i32> [#uses=1]
%tmp4 = icmp ne i32 %tmp2, %tmp3 ; <i1> [#uses=1]
br i1 %tmp4, label %bb, label %UnifiedReturnBlock
bb: ; preds = %entry
call void @foo()
ret void
UnifiedReturnBlock: ; preds = %entry
ret void
}
define void @test5(i32 %x, i32 %n) nounwind {
entry:
%tmp1 = and i32 %x, 1
%tmp2 = urem i32 %tmp1, 15
%tmp3 = and i32 %tmp2, 1 ; <i32> [#uses=1]
%tmp4 = icmp ne i32 %tmp2, %tmp3 ; <i1> [#uses=1]
br i1 %tmp4, label %bb, label %UnifiedReturnBlock
bb: ; preds = %entry
call void @foo()
ret void
UnifiedReturnBlock: ; preds = %entry
ret void
}
declare void @foo()