b21663cb5b
This fixes an expensive chesk failure after 8476a5d480304. The issue was essentially that getRegClassConstraintEffectForVReg was not doing anything useful, sometimes. If the register passed to it is not present in the instruction, it is a no-op and returns the original classe. The Edit->getReg() register may not be the register as it appears in either the use or def instruction. It may be some split register, so take the register directly from the instruction being rematerialized. Also directly query the constraint from the def instruction, with a hardcoded operand index. This isn't ideal, but all the other rematerialize code makes the same assumption. So far I've been unable to reproduce this with a standalone MIR test. In the original case, stop-before=greedy and running the one pass is not working.
40 lines
1.2 KiB
LLVM
40 lines
1.2 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc -verify-machineinstrs -stress-regalloc=2 -o - %s | FileCheck %s
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; Check that no register class constraint error is produced during
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; rematerialization
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target triple = "thumbv7-apple-ios"
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declare ptr @_Znwm()
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define void @func() {
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; CHECK-LABEL: func:
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; CHECK: @ %bb.0: @ %bb14
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; CHECK-NEXT: str lr, [sp, #-4]!
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; CHECK-NEXT: movs r0, #0
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; CHECK-NEXT: movs r1, #4
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; CHECK-NEXT: str r0, [r1]
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; CHECK-NEXT: movs r1, #8
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; CHECK-NEXT: str r0, [r1]
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; CHECK-NEXT: str r0, [r0]
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; CHECK-NEXT: bl __Znwm
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; CHECK-NEXT: movs r1, #0
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; CHECK-NEXT: movs r0, #4
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; CHECK-NEXT: str r1, [r0]
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; CHECK-NEXT: movs r0, #8
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; CHECK-NEXT: str r1, [r0]
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; CHECK-NEXT: str r1, [r1]
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; CHECK-NEXT: ldr lr, [sp], #4
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; CHECK-NEXT: bx lr
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bb14:
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call void @llvm.memset.p0.i32(ptr null, i8 0, i32 12, i1 false)
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%tmp34 = call ptr @_Znwm()
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call void @llvm.memset.p0.i32(ptr null, i8 0, i32 12, i1 false)
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ret void
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}
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declare void @llvm.memset.p0.i32(ptr writeonly captures(none), i8, i32, i1 immarg) #0
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attributes #0 = { nocallback nofree nounwind willreturn memory(argmem: write) }
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