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0c6bc1e223
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
14 lines
365 B
LLVM
14 lines
365 B
LLVM
; RUN: llc -mtriple=i686-pc-linux -print-after=postrapseudos < %s 2>&1 | FileCheck %s
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; CHECK: MOV8rr %{{[A-D]}}L, %E[[R:[A-D]]]X<imp-use,kill>, %E[[R]]X<imp-def>
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define i32 @foo(i32 %i, i32 %k, i8* %p) {
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%f = icmp ne i32 %i, %k
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%s = zext i1 %f to i8
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%ret = zext i1 %f to i32
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br label %next
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next:
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%d = add i8 %s, 5
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store i8 %d, i8* %p
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ret i32 %ret
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}
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