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cmd/compile/internal/ssa: on PPC64, generate large constant paddi

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This is only supported power10/linux/PPC64. This generates smaller,
faster code by merging a pli + add into paddi.

Change-Id: I1f4d522fce53aea4c072713cc119a9e0d7065acc
Reviewed-on: https://go-review.googlesource.com/c/go/+/531717
Run-TryBot: Paul Murphy <murp@ibm.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Than McIntosh <thanm@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com>
This commit is contained in:
Paul E. Murphy 2023-09-15 15:20:56 -05:00 committed by Paul Murphy
parent 3550a84840
commit 061d77cb70
3 changed files with 45 additions and 0 deletions
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3
src/cmd/compile/internal/ssa/_gen/PPC64latelower.rules
View file

@ -33,3 +33,6 @@
// Convert rotated 32 bit masks on 32 bit values into rlwinm. In general, this leaves the upper 32 bits in an undefined state.
(AND <t> x:(MOVDconst [m]) n) && t.Size() == 4 && isPPC64WordRotateMask(m) => (RLWINM [encodePPC64RotateMask(0,m,32)] n)
// When PCRel is supported, paddi can add a 34b signed constant in one instruction.
(ADD (MOVDconst [m]) x) && supportsPPC64PCRel() && (m<<30)>>30 == m => (ADDconst [m] x)

27
src/cmd/compile/internal/ssa/rewritePPC64latelower.go
View file

@ -7,6 +7,8 @@ import "cmd/compile/internal/types"
func rewriteValuePPC64latelower(v *Value) bool {
switch v.Op {
case OpPPC64ADD:
return rewriteValuePPC64latelower_OpPPC64ADD(v)
case OpPPC64AND:
return rewriteValuePPC64latelower_OpPPC64AND(v)
case OpPPC64ISEL:
@ -22,6 +24,31 @@ func rewriteValuePPC64latelower(v *Value) bool {
}
return false
}
func rewriteValuePPC64latelower_OpPPC64ADD(v *Value) bool {
v_1 := v.Args[1]
v_0 := v.Args[0]
// match: (ADD (MOVDconst [m]) x)
// cond: supportsPPC64PCRel() && (m<<30)>>30 == m
// result: (ADDconst [m] x)
for {
for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
if v_0.Op != OpPPC64MOVDconst {
continue
}
m := auxIntToInt64(v_0.AuxInt)
x := v_1
if !(supportsPPC64PCRel() && (m<<30)>>30 == m) {
continue
}
v.reset(OpPPC64ADDconst)
v.AuxInt = int64ToAuxInt(m)
v.AddArg(x)
return true
}
break
}
return false
}
func rewriteValuePPC64latelower_OpPPC64AND(v *Value) bool {
v_1 := v.Args[1]
v_0 := v.Args[0]

15
test/codegen/arithmetic.go
View file

@ -10,6 +10,21 @@ package codegen
// simplifications and optimizations on integer types.
// For codegen tests on float types, see floats.go.
// ----------------- //
// Addition //
// ----------------- //
func AddLargeConst(a uint64, out []uint64) {
// ppc64x/power10:"ADD\t[$]4294967296,"
// ppc64x/power9:"MOVD\t[$]i64.0000000100000000[(]SB[)]", "ADD\tR[0-9]*"
// ppc64x/power8:"MOVD\t[$]i64.0000000100000000[(]SB[)]", "ADD\tR[0-9]*"
out[0] = a + 0x100000000
// ppc64x/power10:"ADD\t[$]-8589934592,"
// ppc64x/power9:"MOVD\t[$]i64.fffffffe00000000[(]SB[)]", "ADD\tR[0-9]*"
// ppc64x/power8:"MOVD\t[$]i64.fffffffe00000000[(]SB[)]", "ADD\tR[0-9]*"
out[1] = a + 0xFFFFFFFE00000000
}
// ----------------- //
// Subtraction //
// ----------------- //