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68 lines
1.9 KiB
Plaintext
68 lines
1.9 KiB
Plaintext
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# RUN: llc -mtriple=aarch64-apple-ios -run-pass=simple-register-coalescing %s -o - | FileCheck %s
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--- |
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define void @func() { 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: func
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name: func
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registers:
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- { id: 0, class: gpr32 }
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- { id: 1, class: gpr64 }
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- { id: 2, class: gpr64 }
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- { id: 3, class: gpr32 }
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- { id: 4, class: gpr64 }
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- { id: 5, class: gpr32 }
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- { id: 6, class: xseqpairsclass }
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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 = COPY %w7
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; CHECK: STRWui %0, %x1, 0
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%0 = 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 = 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 = COPY %fp
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; CHECK: STRXui %2, %x1, 0
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%2 = 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 = 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 = 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 = 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 = COPY %xzr_x0
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; CHECK: HINT 0, implicit %6
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%6 = COPY %xzr_x0
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HINT 0, implicit %6
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...
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