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Check for both styles of clobbers, those produced by dragonegg and

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those produced by clang for the inline asm bswap conversion.

Modified from a patch by Chris Smowton.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194016 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Christopher 2013-11-04 21:41:21 +00:00
parent 63d8f88686
commit 3faf43fc66
2 changed files with 41 additions and 20 deletions
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30
lib/Target/X86/X86ISelLowering.cpp
View File

@ -19182,6 +19182,22 @@ namespace {
const VariadicFunction1<bool, StringRef, StringRef, matchAsmImpl> matchAsm={};
}
static bool clobbersFlagRegisters(const SmallVector<StringRef, 4> &AsmPieces) {
if (AsmPieces.size() == 3 || AsmPieces.size() == 4) {
if (std::count(AsmPieces.begin(), AsmPieces.end(), "~{cc}") &&
std::count(AsmPieces.begin(), AsmPieces.end(), "~{flags}") &&
std::count(AsmPieces.begin(), AsmPieces.end(), "~{fpsr}")) {
if (AsmPieces.size() == 3)
return true;
else if (std::count(AsmPieces.begin(), AsmPieces.end(), "~{dirflag}"))
return true;
}
}
return false;
}
bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
InlineAsm *IA = cast<InlineAsm>(CI->getCalledValue());
@ -19223,12 +19239,8 @@ bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
const std::string &ConstraintsStr = IA->getConstraintString();
SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
array_pod_sort(AsmPieces.begin(), AsmPieces.end());
if (AsmPieces.size() == 4 &&
AsmPieces[0] == "~{cc}" &&
AsmPieces[1] == "~{dirflag}" &&
AsmPieces[2] == "~{flags}" &&
AsmPieces[3] == "~{fpsr}")
return IntrinsicLowering::LowerToByteSwap(CI);
if (clobbersFlagRegisters(AsmPieces))
return IntrinsicLowering::LowerToByteSwap(CI);
}
break;
case 3:
@ -19241,11 +19253,7 @@ bool X86TargetLowering::ExpandInlineAsm(CallInst *CI) const {
const std::string &ConstraintsStr = IA->getConstraintString();
SplitString(StringRef(ConstraintsStr).substr(5), AsmPieces, ",");
array_pod_sort(AsmPieces.begin(), AsmPieces.end());
if (AsmPieces.size() == 4 &&
AsmPieces[0] == "~{cc}" &&
AsmPieces[1] == "~{dirflag}" &&
AsmPieces[2] == "~{flags}" &&
AsmPieces[3] == "~{fpsr}")
if (clobbersFlagRegisters(AsmPieces))
return IntrinsicLowering::LowerToByteSwap(CI);
}

31
test/CodeGen/X86/inline-asm-flag-clobber.ll
View File

@ -2,18 +2,31 @@
; PR3701
define i64 @t(i64* %arg) nounwind {
br i1 true, label %1, label %5
br i1 true, label %1, label %5
; <label>:1 ; preds = %0
%2 = icmp eq i64* null, %arg ; <i1> [#uses=1]
%3 = tail call i64* asm sideeffect "movl %fs:0,$0", "=r,~{dirflag},~{fpsr},~{flags}"() nounwind ; <%struct.thread*> [#uses=0]
; <label>:1 ; preds = %0
%2 = icmp eq i64* null, %arg ; <i1> [#uses=1]
%3 = tail call i64* asm sideeffect "movl %fs:0,$0", "=r,~{dirflag},~{fpsr},~{flags}"() nounwind ; <%struct.thread*> [#uses=0]
; CHECK: test
; CHECK-NEXT: j
br i1 %2, label %4, label %5
br i1 %2, label %4, label %5
; <label>:4 ; preds = %1
ret i64 1
; <label>:4 ; preds = %1
ret i64 1
; <label>:5 ; preds = %1
ret i64 0
; <label>:5 ; preds = %1
ret i64 0
}
; Make sure that we translate this to the bswap intrinsic which lowers down without the
; inline assembly.
; CHECK-NOT: #APP
define i32 @s(i32 %argc, i8** nocapture %argv) unnamed_addr nounwind {
entry:
%0 = trunc i32 %argc to i16
%asmtmp = tail call i16 asm "rorw $$8, ${0:w}", "=r,0,~{fpsr},~{flags},~{cc}"(i16 %0) nounwind, !srcloc !0
%1 = zext i16 %asmtmp to i32
ret i32 %1
}
!0 = metadata !{i64 935930}