cmd/compile: combine operations with immediate on riscv64

Replace two immediate operations with one, where possible. Change-Id: Idc00e868155c9ca1d872aaaf70ea1f73e9eac4d6 Reviewed-on: https://go-review.googlesource.com/c/go/+/428497 Reviewed-by: Wayne Zuo <wdvxdr@golangcn.org> TryBot-Result: Gopher Robot <gobot@golang.org> Run-TryBot: Joel Sing <joel@sing.id.au> Reviewed-by: David Chase <drchase@google.com> Reviewed-by: Cherry Mui <cherryyz@google.com>
golang · Sep 19, 2022 · 7234c90 · 7234c90
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diff --git a/src/cmd/compile/internal/ssa/gen/RISCV64.rules b/src/cmd/compile/internal/ssa/gen/RISCV64.rules
@@ -788,6 +788,11 @@
 (ORI [-1] x) => (MOVDconst [-1])
 (ORI [x] (MOVDconst [y])) => (MOVDconst [x | y])
 
+// Combine operations with immediate.
+(ADDI [x] (ADDI [y] z)) && is32Bit(x + y) => (ADDI [x + y] z)
+(ANDI [x] (ANDI [y] z)) => (ANDI [x & y] z)
+(ORI  [x] (ORI  [y] z)) => (ORI  [x | y] z)
+
 // Negation of a constant.
 (NEG  (MOVDconst [x])) => (MOVDconst [-x])
 (NEGW (MOVDconst [x])) => (MOVDconst [int64(int32(-x))])

diff --git a/src/cmd/compile/internal/ssa/rewriteRISCV64.go b/src/cmd/compile/internal/ssa/rewriteRISCV64.go