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llvm-6502/test/CodeGen/X86/2009-12-01-EarlyClobberBug.ll
Evan Cheng 9836a26da3 Fix PR5391: support early clobber physical register def tied with a use (ewwww)
- A valno should be set HasRedefByEC if there is an early clobber def in the middle of its live ranges. It should not be set if the def of the valno is defined by an early clobber.
- If a physical register def is tied to an use and it's an early clobber, it just means the HasRedefByEC is set since it's still one continuous live range.
- Add a couple of missing checks for HasRedefByEC in the coalescer. In general, it should not coalesce a vr with a physical register if the physical register has a early clobber def somewhere. This is overly conservative but that's the price for using such a nasty inline asm "feature".


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90269 91177308-0d34-0410-b5e6-96231b3b80d8
2009-12-01 22:25:00 +00:00

39 lines
1.5 KiB
LLVM

; RUN: llc < %s -mtriple=x86_64-apple-darwin | FileCheck %s
; pr5391
define void @t() nounwind ssp {
entry:
; CHECK: t:
; CHECK: movl %ecx, %eax
; CHECK: %eax = foo (%eax, %ecx)
%b = alloca i32 ; <i32*> [#uses=2]
%a = alloca i32 ; <i32*> [#uses=1]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%0 = load i32* %b, align 4 ; <i32> [#uses=1]
%1 = load i32* %b, align 4 ; <i32> [#uses=1]
%asmtmp = call i32 asm "$0 = foo ($1, $2)", "=&{ax},%0,r,~{dirflag},~{fpsr},~{flags}"(i32 %0, i32 %1) nounwind ; <i32> [#uses=1]
store i32 %asmtmp, i32* %a
br label %return
return: ; preds = %entry
ret void
}
define void @t2() nounwind ssp {
entry:
; CHECK: t2:
; CHECK: movl %eax, %ecx
; CHECK: %ecx = foo (%ecx, %eax)
%b = alloca i32 ; <i32*> [#uses=2]
%a = alloca i32 ; <i32*> [#uses=1]
%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
%0 = load i32* %b, align 4 ; <i32> [#uses=1]
%1 = load i32* %b, align 4 ; <i32> [#uses=1]
%asmtmp = call i32 asm "$0 = foo ($1, $2)", "=&r,%0,r,~{dirflag},~{fpsr},~{flags}"(i32 %0, i32 %1) nounwind ; <i32> [#uses=1]
store i32 %asmtmp, i32* %a
br label %return
return: ; preds = %entry
ret void
}