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| author | Joel Sing <joel@sing.id.au> | 2025-02-22 23:26:21 +1100 |
|---|---|---|
| committer | Joel Sing <joel@sing.id.au> | 2025-02-27 03:45:44 -0800 |
| commit | 927fdb7843ce96b42791912b42d0d3e6735e8dde (patch) | |
| tree | 27ebbc2cf16f07ccb33f555d31327ce758e5bf4d /test/codegen/mathbits.go | |
| parent | 01ba8bfe868df2eea10ea8dd5bfbe5af0549909d (diff) | |
| download | go-927fdb7843ce96b42791912b42d0d3e6735e8dde.tar.xz | |
cmd/compile: simplify intrinsification of TrailingZeros16 and TrailingZeros8
Decompose Ctz16 and Ctz8 within the SSA rules for LOONG64, MIPS, PPC64
and S390X, rather than having a custom intrinsic. Note that for PPC64 this
actually allows the existing Ctz16 and Ctz8 rules to be used.
Change-Id: I27a5e978f852b9d75396d2a80f5d7dfcb5ef7dd4
Reviewed-on: https://go-review.googlesource.com/c/go/+/651816
Reviewed-by: Paul Murphy <murp@ibm.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Keith Randall <khr@google.com>
Diffstat (limited to 'test/codegen/mathbits.go')
| -rw-r--r-- | test/codegen/mathbits.go | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/test/codegen/mathbits.go b/test/codegen/mathbits.go index baed4f7c67..78556c636f 100644 --- a/test/codegen/mathbits.go +++ b/test/codegen/mathbits.go @@ -409,7 +409,7 @@ func TrailingZeros16(n uint16) int { // arm64:"ORR\t\\$65536","RBITW","CLZW",-"MOVHU\tR",-"RBIT\t",-"CLZ\t" // loong64:"CTZV" // s390x:"FLOGR","OR\t\\$65536" - // ppc64x/power8:"POPCNTD","ORIS\\t\\$1" + // ppc64x/power8:"POPCNTW","ADD\t\\$-1" // ppc64x/power9:"CNTTZD","ORIS\\t\\$1" // wasm:"I64Ctz" return bits.TrailingZeros16(n) @@ -421,6 +421,8 @@ func TrailingZeros8(n uint8) int { // arm:"ORR\t\\$256","CLZ",-"MOVBU\tR" // arm64:"ORR\t\\$256","RBITW","CLZW",-"MOVBU\tR",-"RBIT\t",-"CLZ\t" // loong64:"CTZV" + // ppc64x/power8:"POPCNTB","ADD\t\\$-1" + // ppc64x/power9:"CNTTZD","OR\t\\$256" // s390x:"FLOGR","OR\t\\$256" // wasm:"I64Ctz" return bits.TrailingZeros8(n) |