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cmd/compile/internal/ssa: on PPC64, generate large constant paddi
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>
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@ -33,3 +33,6 @@
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// Convert rotated 32 bit masks on 32 bit values into rlwinm. In general, this leaves the upper 32 bits in an undefined state.
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(AND <t> x:(MOVDconst [m]) n) && t.Size() == 4 && isPPC64WordRotateMask(m) => (RLWINM [encodePPC64RotateMask(0,m,32)] n)
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// When PCRel is supported, paddi can add a 34b signed constant in one instruction.
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(ADD (MOVDconst [m]) x) && supportsPPC64PCRel() && (m<<30)>>30 == m => (ADDconst [m] x)
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@ -7,6 +7,8 @@ import "cmd/compile/internal/types"
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func rewriteValuePPC64latelower(v *Value) bool {
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switch v.Op {
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case OpPPC64ADD:
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return rewriteValuePPC64latelower_OpPPC64ADD(v)
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case OpPPC64AND:
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return rewriteValuePPC64latelower_OpPPC64AND(v)
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case OpPPC64ISEL:
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@ -22,6 +24,31 @@ func rewriteValuePPC64latelower(v *Value) bool {
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}
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return false
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}
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func rewriteValuePPC64latelower_OpPPC64ADD(v *Value) bool {
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v_1 := v.Args[1]
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v_0 := v.Args[0]
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// match: (ADD (MOVDconst [m]) x)
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// cond: supportsPPC64PCRel() && (m<<30)>>30 == m
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// result: (ADDconst [m] x)
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for {
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for _i0 := 0; _i0 <= 1; _i0, v_0, v_1 = _i0+1, v_1, v_0 {
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if v_0.Op != OpPPC64MOVDconst {
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continue
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}
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m := auxIntToInt64(v_0.AuxInt)
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x := v_1
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if !(supportsPPC64PCRel() && (m<<30)>>30 == m) {
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continue
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}
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v.reset(OpPPC64ADDconst)
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v.AuxInt = int64ToAuxInt(m)
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v.AddArg(x)
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return true
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}
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break
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}
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return false
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}
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func rewriteValuePPC64latelower_OpPPC64AND(v *Value) bool {
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v_1 := v.Args[1]
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v_0 := v.Args[0]
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@ -10,6 +10,21 @@ package codegen
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// simplifications and optimizations on integer types.
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// For codegen tests on float types, see floats.go.
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// ----------------- //
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// Addition //
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// ----------------- //
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func AddLargeConst(a uint64, out []uint64) {
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// ppc64x/power10:"ADD\t[$]4294967296,"
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// ppc64x/power9:"MOVD\t[$]i64.0000000100000000[(]SB[)]", "ADD\tR[0-9]*"
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// ppc64x/power8:"MOVD\t[$]i64.0000000100000000[(]SB[)]", "ADD\tR[0-9]*"
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out[0] = a + 0x100000000
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// ppc64x/power10:"ADD\t[$]-8589934592,"
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// ppc64x/power9:"MOVD\t[$]i64.fffffffe00000000[(]SB[)]", "ADD\tR[0-9]*"
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// ppc64x/power8:"MOVD\t[$]i64.fffffffe00000000[(]SB[)]", "ADD\tR[0-9]*"
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out[1] = a + 0xFFFFFFFE00000000
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}
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// ----------------- //
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// Subtraction //
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// ----------------- //
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