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llvm-project/llvm/test/CodeGen/X86/pr28560.ll

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ExpandPostRAPseudos should transfer implicit uses, not only implicit defs Previously, we would expand: %BL<def> = COPY %DL<kill>, %EBX<imp-use,kill>, %EBX<imp-def> Into: %BL<def> = MOV8rr %DL<kill>, %EBX<imp-def> Dropping the imp-use on the floor. That confused CriticalAntiDepBreaker, which (correctly) assumes that if an instruction defs but doesn't use a register, that register is dead immediately before the instruction - while in this case, the high lanes of EBX can be very much alive. This fixes PR28560. Differential Revision: https://reviews.llvm.org/D22425 llvm-svn: 275634
2016-07-16 06:31:14 +08:00
; RUN: llc -mtriple=i686-pc-linux -print-after=postrapseudos < %s 2>&1 | FileCheck %s
Followup on Proposal to move MIR physical register namespace to '$' sigil. Discussed here: http://lists.llvm.org/pipermail/llvm-dev/2018-January/120320.html In preparation for adding support for named vregs we are changing the sigil for physical registers in MIR to '$' from '%'. This will prevent name clashes of named physical register with named vregs. llvm-svn: 323922
2018-02-01 06:04:26 +08:00
; CHECK: MOV8rr ${{[a-d]}}l, implicit killed $e[[R:[a-d]]]x, implicit-def $e[[R]]x
ExpandPostRAPseudos should transfer implicit uses, not only implicit defs Previously, we would expand: %BL<def> = COPY %DL<kill>, %EBX<imp-use,kill>, %EBX<imp-def> Into: %BL<def> = MOV8rr %DL<kill>, %EBX<imp-def> Dropping the imp-use on the floor. That confused CriticalAntiDepBreaker, which (correctly) assumes that if an instruction defs but doesn't use a register, that register is dead immediately before the instruction - while in this case, the high lanes of EBX can be very much alive. This fixes PR28560. Differential Revision: https://reviews.llvm.org/D22425 llvm-svn: 275634
2016-07-16 06:31:14 +08:00
define i32 @foo(i32 %i, i32 %k, i8* %p) {
%f = icmp ne i32 %i, %k
%s = zext i1 %f to i8
%ret = zext i1 %f to i32
br label %next
next:
%d = add i8 %s, 5
store i8 %d, i8* %p
ret i32 %ret
}