llvm-6502/test/CodeGen/X86/2010-09-01-RemoveCopyByCommutingDef.ll
Jakob Stoklund Olesen 0077114efc Teach RemoveCopyByCommutingDef to check all aliases, not just subregisters.
This caused a miscompilation in WebKit where %RAX had conflicting defs when
RemoveCopyByCommutingDef was commuting a %EAX use.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112751 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-01 22:15:35 +00:00

29 lines
1.2 KiB
LLVM

; RUN: llc < %s -verify-machineinstrs | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.0.0"
; This test exercises the alias checking in SimpleRegisterCoalescing::RemoveCopyByCommutingDef.
define void @f(i32* %w, i32* %h, i8* %_this, i8* %image) nounwind ssp {
%x1 = tail call i64 @g(i8* %_this, i8* %image) nounwind ; <i64> [#uses=3]
%tmp1 = trunc i64 %x1 to i32 ; <i32> [#uses=1]
; CHECK: movl (%r{{.*}}), %
%x4 = load i32* %h, align 4 ; <i32> [#uses=1]
; The imull clobbers a 32-bit register.
; CHECK: imull %{{...}}, %e[[CLOBBER:..]]
%x5 = mul nsw i32 %x4, %tmp1 ; <i32> [#uses=1]
; So we cannot use the corresponding 64-bit register anymore.
; CHECK-NOT: shrq $32, %r[[CLOBBER]]
%btmp3 = lshr i64 %x1, 32 ; <i64> [#uses=1]
%btmp4 = trunc i64 %btmp3 to i32 ; <i32> [#uses=1]
; CHECK: idiv
%x6 = sdiv i32 %x5, %btmp4 ; <i32> [#uses=1]
store i32 %x6, i32* %w, align 4
ret void
}
declare i64 @g(i8*, i8*)