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inst,ir: cancelling inputs (#92)

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Adds support for a `CancellingInputs` instruction flag, to indicate cases like `XORQ R10, R10` where the instruction actually does not depend on the value of `R10` at all.

Closes #89
This commit is contained in:
Michael McLoughlin
2019-07-28 17:58:49 -07:00
committed by GitHub
parent 8f97788836
commit d43efabdbe
16 changed files with 970 additions and 392 deletions
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8
examples/dot/dot.s
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@@ -35,13 +35,13 @@ blockloop:
JMP blockloop
tail:
VXORPS X12, X12, X12
VXORPS X6, X6, X6
tailloop:
CMPQ DX, $0x00000000
JE reduce
VMOVSS (AX), X6
VFMADD231SS (CX), X6, X12
VMOVSS (AX), X7
VFMADD231SS (CX), X7, X6
ADDQ $0x00000004, AX
ADDQ $0x00000004, CX
DECQ DX
@@ -55,7 +55,7 @@ reduce:
VADDPS Y0, Y5, Y0
VEXTRACTF128 $0x01, Y0, X1
VADDPS X0, X1, X0
VADDPS X0, X12, X0
VADDPS X0, X6, X0
VHADDPS X0, X0, X0
VHADDPS X0, X0, X0
MOVSS X0, ret+48(FP)