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llvm-project/llvm/test/CodeGen/X86/bit-test-shift.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-- | FileCheck %s
A select between a constant and zero, when fed by a bit test, can be efficiently lowered using a series of shifts. Fixes <rdar://problem/8285015>. llvm-svn: 114599
2010-09-23 06:58:22 +08:00
; <rdar://problem/8285015>
define i32 @x(i32 %t) nounwind readnone ssp {
entry:
; CHECK: shll $23, %eax
; CHECK: sarl $31, %eax
; CHECK: andl $-26, %eax
%and = and i32 %t, 256
%tobool = icmp eq i32 %and, 0
%retval.0 = select i1 %tobool, i32 0, i32 -26
ret i32 %retval.0
}