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authorJakob Stoklund Olesen <stoklund@2pi.dk>2011-06-27 04:08:33 +0000
committerJakob Stoklund Olesen <stoklund@2pi.dk>2011-06-27 04:08:33 +0000
commitf792fa90f1125553008659c743cba85b9b5d2e5e (patch)
tree55af9377e3bfb8833d0c5f862a6a19f7cd5fb39f /lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
parent7a2ecd3f99ae4dede7e8c1984c2a08984be69363 (diff)
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Distinguish early clobber output operands from clobbered registers.
Both become <earlyclobber> defs on the INLINEASM MachineInstr, but we now use two different asm operand kinds. The new Kind_Clobber is treated identically to the old Kind_RegDefEarlyClobber for now, but x87 floating point stack inline assembly does care about the difference. This will pop a register off the stack: asm("fstp %st" : : "t"(x) : "st"); While this will pop the input and push an output: asm("fst %st" : "=&t"(r) : "t"(x)); We need to know if ST0 was a clobber or an output operand, and we can't depend on <dead> flags for that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133902 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp')
-rw-r--r--lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
index 7b560d173e..6bed1dbc47 100644
--- a/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
+++ b/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
@@ -490,7 +490,8 @@ bool ScheduleDAGFast::DelayForLiveRegsBottomUp(SUnit *SU,
++i; // Skip the ID value.
if (InlineAsm::isRegDefKind(Flags) ||
- InlineAsm::isRegDefEarlyClobberKind(Flags)) {
+ InlineAsm::isRegDefEarlyClobberKind(Flags) ||
+ InlineAsm::isClobberKind(Flags)) {
// Check for def of register or earlyclobber register.
for (; NumVals; --NumVals, ++i) {
unsigned Reg = cast<RegisterSDNode>(Node->getOperand(i))->getReg();