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llvm-mirror/test/CodeGen/X86/callbr-asm-phi-placement.ll
James Y Knight 3c2a4cc1bc PR47468: Fix findPHICopyInsertPoint, so that copies aren't incorrectly inserted after an INLINEASM_BR.
findPHICopyInsertPoint special cases placement in a block with a
callbr or invoke in it. In that case, we must ensure that the copy is
placed before the INLINEASM_BR or call instruction, if the register is
defined prior to that instruction, because it may jump out of the
block.

Previously, the code placed it immediately after the last def _or
use_. This is wrong, if the use is the instruction which may jump.  We
could correctly place it immediately after the last def (ignoring
uses), but that is non-optimal for register pressure.

Instead, place the copy after the last def, or before the
call/inlineasm_br, whichever is later.

Differential Revision: https://reviews.llvm.org/D87865
2020-09-18 14:14:04 -04:00

45 lines
1.3 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -verify-machineinstrs -O2 < %s | FileCheck %s
;; https://bugs.llvm.org/PR47468
;; PHI elimination should place copies BEFORE the inline asm, not
;; after, even if the inline-asm uses as an input the same value as
;; the PHI.
declare void @foo(i8*)
define void @test1(i8* %arg, i8** %mem) nounwind {
; CHECK-LABEL: test1:
; CHECK: # %bb.0: # %entry
; CHECK-NEXT: pushq %r14
; CHECK-NEXT: pushq %rbx
; CHECK-NEXT: pushq %rax
; CHECK-NEXT: movq %rsi, %r14
; CHECK-NEXT: .Ltmp0: # Block address taken
; CHECK-NEXT: .LBB0_1: # %loop
; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
; CHECK-NEXT: movq (%r14), %rbx
; CHECK-NEXT: callq foo
; CHECK-NEXT: movq %rbx, %rdi
; CHECK-NEXT: #APP
; CHECK-NEXT: #NO_APP
; CHECK-NEXT: # %bb.2: # %end
; CHECK-NEXT: addq $8, %rsp
; CHECK-NEXT: popq %rbx
; CHECK-NEXT: popq %r14
; CHECK-NEXT: retq
entry:
br label %loop
loop:
%a = phi i8* [ %arg, %entry ], [ %b, %loop ]
%b = load i8*, i8** %mem, align 8
call void @foo(i8* %a)
callbr void asm sideeffect "", "*m,X"(i8* %b, i8* blockaddress(@test1, %loop))
to label %end [label %loop]
end:
ret void
}