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cmd/compile: use NEG/NEGW pseudo-instructions on riscv64

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Also rewrite subtraction of zero to NEG/NEGW.

Change-Id: I216e286d1860055f2a07fe2f772cd50f366ea097
Reviewed-on: https://go-review.googlesource.com/c/go/+/221691
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Joel Sing 2020-03-03 03:45:22 +11:00
parent 7b2f0ba5b9
commit 26154f31ad
5 changed files with 107 additions and 65 deletions
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2
src/cmd/compile/internal/ssa/gen/RISCV64Ops.go
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@ -131,6 +131,8 @@ func init() {
{name: "ADD", argLength: 2, reg: gp21, asm: "ADD", commutative: true}, // arg0 + arg1
{name: "ADDI", argLength: 1, reg: gp11sb, asm: "ADDI", aux: "Int64"}, // arg0 + auxint
{name: "ADDIW", argLength: 1, reg: gp11, asm: "ADDIW", aux: "Int64"}, // 32 low bits of arg0 + auxint, sign extended to 64 bits
{name: "NEG", argLength: 1, reg: gp11, asm: "NEG"}, // -arg0
{name: "NEGW", argLength: 1, reg: gp11, asm: "NEGW"}, // -arg0 of 32 bits, sign extended to 64 bits
{name: "SUB", argLength: 2, reg: gp21, asm: "SUB"}, // arg0 - arg1
{name: "SUBW", argLength: 2, reg: gp21, asm: "SUBW"}, // 32 low bits of arg 0 - 32 low bits of arg 1, sign extended to 64 bits