Switch ARM target to register masks.
I'll let the buildbots determine the compile time improvements from this
change, but 464.h264ref has 5% faster codegen at -O2.
This patch does cause some assembly changes. Branch folding can make
different decisions about calls with dead return values.
CriticalAntiDepBreaker may choose different registers because its
liveness tracking is affected. MachineCopyPropagation may sometimes
leave a dead copy behind.
llvm-svn: 151331
diff --git a/llvm/lib/Target/ARM/ARMInstrThumb.td b/llvm/lib/Target/ARM/ARMInstrThumb.td
index 9019e8c..ba1791b 100644
--- a/llvm/lib/Target/ARM/ARMInstrThumb.td
+++ b/llvm/lib/Target/ARM/ARMInstrThumb.td
@@ -406,10 +406,7 @@
// potentially appearing dead.
let isCall = 1,
// On non-IOS platforms R9 is callee-saved.
- Defs = [R0, R1, R2, R3, R12, LR,
- Q0, Q1, Q2, Q3, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15,
- CPSR, FPSCR],
- Uses = [SP] in {
+ Defs = [LR], Uses = [SP] in {
// Also used for Thumb2
def tBL : TIx2<0b11110, 0b11, 1,
(outs), (ins pred:$p, t_bltarget:$func, variable_ops), IIC_Br,
@@ -460,10 +457,7 @@
// On IOS R9 is call-clobbered.
// R7 is marked as a use to prevent frame-pointer assignments from being
// moved above / below calls.
- Defs = [R0, R1, R2, R3, R9, R12, LR,
- Q0, Q1, Q2, Q3, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15,
- CPSR, FPSCR],
- Uses = [R7, SP] in {
+ Defs = [LR], Uses = [R7, SP] in {
// Also used for Thumb2
def tBLr9 : tPseudoExpand<(outs), (ins pred:$p, t_bltarget:$func, variable_ops),
4, IIC_Br, [(ARMtcall tglobaladdr:$func)],
@@ -529,9 +523,7 @@
// Tail calls
let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1 in {
// IOS versions.
- let Defs = [R0, R1, R2, R3, R9, R12,
- Q0, Q1, Q2, Q3, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, PC],
- Uses = [SP] in {
+ let Uses = [SP] in {
// tTAILJMPd: IOS version uses a Thumb2 branch (no Thumb1 tail calls
// on IOS), so it's in ARMInstrThumb2.td.
def tTAILJMPr : tPseudoExpand<(outs), (ins tcGPR:$dst, variable_ops),
@@ -540,9 +532,7 @@
Requires<[IsThumb, IsIOS]>;
}
// Non-IOS versions (the difference is R9).
- let Defs = [R0, R1, R2, R3, R12,
- Q0, Q1, Q2, Q3, Q8, Q9, Q10, Q11, Q12, Q13, Q14, Q15, PC],
- Uses = [SP] in {
+ let Uses = [SP] in {
def tTAILJMPdND : tPseudoExpand<(outs),
(ins t_brtarget:$dst, pred:$p, variable_ops),
4, IIC_Br, [],
