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d4c615be8c
Discussed here: http://lists.llvm.org/pipermail/llvm-dev/2018-January/120320.html In preparation for adding support for named vregs we are changing the sigil for physical registers in MIR to '$' from '%'. This will prevent name clashes of named physical register with named vregs. llvm-svn: 323922
136 lines
3.7 KiB
YAML
136 lines
3.7 KiB
YAML
# RUN: llc -mtriple=aarch64-apple-ios -run-pass=simple-register-coalescing %s -o - | FileCheck %s
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--- |
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declare void @f2()
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define void @func0() { ret void }
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define void @func1() { ret void }
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define void @func2() { ret void }
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...
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---
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# Check coalescing of COPYs from reserved physregs.
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# CHECK-LABEL: name: func0
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name: func0
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body: |
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bb.0:
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; We usually should not coalesce copies from allocatable physregs.
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; CHECK: %0:gpr32 = COPY $w7
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; CHECK: STRWui %0, $x1, 0
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%0 : gpr32 = COPY $w7
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STRWui %0, $x1, 0
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; It is fine to coalesce copies from reserved physregs
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; CHECK-NOT: COPY
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; CHECK: STRXui $fp, $x1, 0
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%1 : gpr64 = COPY $fp
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STRXui %1, $x1, 0
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; It is not fine to coalesce copies from reserved physregs when they are
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; clobbered.
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; CHECK: %2:gpr64 = COPY $fp
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; CHECK: STRXui %2, $x1, 0
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%2 : gpr64 = COPY $fp
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$fp = SUBXri $fp, 4, 0
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STRXui %2, $x1, 0
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; Is is fine to coalesce copies from constant physregs even when they are
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; clobbered.
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; CHECK-NOT: COPY
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; CHECK: STRWui $wzr, $x1
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%3 : gpr32 = COPY $wzr
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dead $wzr = SUBSWri $w1, 0, 0, implicit-def $nzcv
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STRWui %3, $x1, 0
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; Is is fine to coalesce copies from constant physregs even when they are
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; clobbered.
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; CHECK-NOT: COPY
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; CHECK: STRXui $xzr, $x1
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%4 : gpr64 = COPY $xzr
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dead $wzr = SUBSWri $w1, 0, 0, implicit-def $nzcv
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STRXui %4, $x1, 0
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; Coalescing COPYs into constant physregs.
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; CHECK: $wzr = SUBSWri $w1, 0, 0
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%5 : gpr32 = SUBSWri $w1, 0, 0, implicit-def $nzcv
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$wzr = COPY %5
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; Only coalesce when the source register is reserved as a whole (this is
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; a limitation of the current code which cannot update liveness information
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; of the non-reserved part).
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; CHECK: %6:xseqpairsclass = COPY $x28_fp
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; CHECK: HINT 0, implicit %6
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%6 : xseqpairsclass = COPY $x28_fp
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HINT 0, implicit %6
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; It is not fine to coalesce copies from reserved physregs when they are
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; clobbered by the regmask on a call.
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; CHECK: %7:gpr64 = COPY $x18
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; CHECK: BL @f2, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
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; CHECK: STRXui %7, $x1, 0
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; Need a def of x18 so that it's not deduced as "constant".
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$x18 = COPY $xzr
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%7 : gpr64 = COPY $x18
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BL @f2, csr_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
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STRXui %7, $x1, 0
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; This can be coalesced.
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; CHECK: $fp = SUBXri $fp, 4, 0
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%8 : gpr64sp = SUBXri $fp, 4, 0
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$fp = COPY %8
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; Cannot coalesce when there are reads of the physreg.
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; CHECK-NOT: $fp = SUBXri $fp, 8, 0
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; CHECK: %9:gpr64sp = SUBXri $fp, 8, 0
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; CHECK: STRXui $fp, $fp, 0
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; CHECK: $fp = COPY %9
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%9 : gpr64sp = SUBXri $fp, 8, 0
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STRXui $fp, $fp, 0
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$fp = COPY %9
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...
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---
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# Check coalescing of COPYs from reserved physregs.
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# CHECK-LABEL: name: func1
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name: func1
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body: |
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bb.0:
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; Cannot coalesce physreg because we have reads on other CFG paths (we
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; currently abort for any control flow)
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; CHECK-NOT: $fp = SUBXri
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; CHECK: %0:gpr64sp = SUBXri $fp, 12, 0
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; CHECK: CBZX undef $x0, %bb.1
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; CHECK: B %bb.2
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%0 : gpr64sp = SUBXri $fp, 12, 0
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CBZX undef $x0, %bb.1
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B %bb.2
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bb.1:
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$fp = COPY %0
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RET_ReallyLR
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bb.2:
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STRXui $fp, $fp, 0
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RET_ReallyLR
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...
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---
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# CHECK-LABEL: name: func2
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name: func2
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body: |
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bb.0:
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; We can coalesce copies from physreg to vreg across multiple blocks.
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; CHECK-NOT: COPY
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; CHECK: CBZX undef $x0, %bb.1
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; CHECK-NEXT: B %bb.2
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%0 : gpr64sp = COPY $fp
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CBZX undef $x0, %bb.1
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B %bb.2
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bb.1:
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; CHECK: STRXui undef $x0, $fp, 0
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; CHECK-NEXT: RET_ReallyLR
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STRXui undef $x0, %0, 0
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RET_ReallyLR
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bb.2:
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RET_ReallyLR
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...
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