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| author | Joel Sing <joel@sing.id.au> | 2020-03-31 02:00:50 +1100 |
|---|---|---|
| committer | Joel Sing <joel@sing.id.au> | 2020-04-27 17:49:30 +0000 |
| commit | 40f2dab0e1740965c014ce22d194cc3fa2976868 (patch) | |
| tree | d552aa65bd4012d4af90d7353c53fc3c631ea8a5 /src/cmd/compile/internal/ssa/gen/RISCV64.rules | |
| parent | 1518123114d12d852d92793bd986e8856ac13e25 (diff) | |
| download | go-40f2dab0e1740965c014ce22d194cc3fa2976868.tar.gz go-40f2dab0e1740965c014ce22d194cc3fa2976868.zip | |
cmd/compile: implement multi-control branches for riscv64
Implement multi-control branches for riscv64, switching to using the BNEZ
pseudo-instruction when rewriting conditionals. This will allow for further
branch optimisations to later be performed via rewrites.
Change-Id: I7f2c69f3c77494b403f26058c6bc8432d8070ad0
Reviewed-on: https://go-review.googlesource.com/c/go/+/226399
Reviewed-by: Keith Randall <khr@golang.org>
Run-TryBot: Joel Sing <joel@sing.id.au>
Diffstat (limited to 'src/cmd/compile/internal/ssa/gen/RISCV64.rules')
| -rw-r--r-- | src/cmd/compile/internal/ssa/gen/RISCV64.rules | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/src/cmd/compile/internal/ssa/gen/RISCV64.rules b/src/cmd/compile/internal/ssa/gen/RISCV64.rules index f18283680f..845ca58b6e 100644 --- a/src/cmd/compile/internal/ssa/gen/RISCV64.rules +++ b/src/cmd/compile/internal/ssa/gen/RISCV64.rules @@ -447,13 +447,13 @@ // Conditional branches // -// cond is 1 if true. BNE compares against 0. +// cond is 1 if true. // // TODO(prattmic): RISCV branch instructions take two operands to compare, // so we could generate more efficient code by computing the condition in the // branch itself. This should be revisited now that the compiler has support // for two control values (https://golang.org/cl/196557). -(If cond yes no) => (BNE cond yes no) +(If cond yes no) => (BNEZ cond yes no) // Calls (StaticCall ...) => (CALLstatic ...) @@ -483,7 +483,7 @@ // Optimizations // Absorb SNEZ into branch. -(BNE (SNEZ x) yes no) => (BNE x yes no) +(BNEZ (SNEZ x) yes no) => (BNEZ x yes no) // Store zero (MOVBstore [off] {sym} ptr (MOVBconst [0]) mem) => (MOVBstorezero [off] {sym} ptr mem) |