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llvm-mirror/test/CodeGen/X86/2009-12-01-EarlyClobberBug.ll
Jakob Stoklund Olesen acaf9e9ce1 Be more aggressive about following hints.
RAGreedy::tryAssign will now evict interference from the preferred
register even when another register is free.

To support this, add the EvictionCost struct that counts how many hints
are broken by an eviction. We don't want to break one hint just to
satisfy another.

Rename canEvict to shouldEvict, and add the first bit of eviction policy
that doesn't depend on spill weights: Always make room in the preferred
register as long as the evictees can be split and aren't already
assigned to their preferred register.

Also make the CSR avoidance more accurate. When looking for a cheaper
register it is OK to use a new volatile register. Only CSR aliases that
have never been used before should be avoided.

llvm-svn: 134735
2011-07-08 20:46:18 +00:00

42 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
; CHECK: [[D2:%e.x]] = foo
; CHECK: ([[D2]],
; CHECK-NOT: [[D2]]
; CHECK: )
%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
}