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test/codegen: port MULs merging tests to codegen

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And delete them from asm_go.

Change-Id: I0057cbd90ca55fa51c596e32406e190f3866f93e
Reviewed-on: https://go-review.googlesource.com/99815
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Alberto Donizetti 2018-03-09 14:51:30 +01:00
parent 91f74069ef
commit 5f541b11aa
2 changed files with 34 additions and 66 deletions
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66
src/cmd/compile/internal/gc/asm_test.go
View file

@ -499,43 +499,6 @@ var linuxAMD64Tests = []*asmTest{
`,
pos: []string{"\tBTQ\t\\$60"},
},
// multiplication merging tests
{
fn: `
func mul1(n int) int {
return 15*n + 31*n
}`,
pos: []string{"\tIMULQ\t[$]46"}, // 46*n
},
{
fn: `
func mul2(n int) int {
return 5*n + 7*(n+1) + 11*(n+2)
}`,
pos: []string{"\tIMULQ\t[$]23", "\tADDQ\t[$]29"}, // 23*n + 29
},
{
fn: `
func mul3(a, n int) int {
return a*n + 19*n
}`,
pos: []string{"\tADDQ\t[$]19", "\tIMULQ"}, // (a+19)*n
},
{
fn: `
func mul4(n int) int {
return 23*n - 9*n
}`,
pos: []string{"\tIMULQ\t[$]14"}, // 14*n
},
{
fn: `
func mul5(a, n int) int {
return a*n - 19*n
}`,
pos: []string{"\tADDQ\t[$]-19", "\tIMULQ"}, // (a-19)*n
},
// see issue 19595.
// We want to merge load+op in f58, but not in f59.
{
@ -906,21 +869,6 @@ var linuxAMD64Tests = []*asmTest{
}
var linux386Tests = []*asmTest{
// multiplication merging tests
{
fn: `
func $(n int) int {
return 9*n + 14*n
}`,
pos: []string{"\tIMULL\t[$]23"}, // 23*n
},
{
fn: `
func $(a, n int) int {
return 19*a + a*n
}`,
pos: []string{"\tADDL\t[$]19", "\tIMULL"}, // (n+19)*a
},
{
// check that stack store is optimized away
fn: `
@ -931,20 +879,6 @@ var linux386Tests = []*asmTest{
`,
pos: []string{"TEXT\t.*, [$]0-4"},
},
{
fn: `
func mul3(n int) int {
return 23*n - 9*n
}`,
pos: []string{"\tIMULL\t[$]14"}, // 14*n
},
{
fn: `
func mul4(a, n int) int {
return n*a - a*19
}`,
pos: []string{"\tADDL\t[$]-19", "\tIMULL"}, // (n-19)*a
},
// Check that len() and cap() div by a constant power of two
// are compiled into SHRL.
{

34
test/codegen/arithmetic.go
View file

@ -24,3 +24,37 @@ func Pow2Muls(n1, n2 int) (int, int) {
return a, b
}
// ------------------ //
// MULs merging //
// ------------------ //
func MergeMuls1(n int) int {
// amd64:"IMULQ\t[$]46"
// 386:"IMULL\t[$]46"
return 15*n + 31*n // 46n
}
func MergeMuls2(n int) int {
// amd64:"IMULQ\t[$]23","ADDQ\t[$]29"
// 386:"IMULL\t[$]23","ADDL\t[$]29"
return 5*n + 7*(n+1) + 11*(n+2) // 23n + 29
}
func MergeMuls3(a, n int) int {
// amd64:"ADDQ\t[$]19",-"IMULQ\t[$]19"
// 386:"ADDL\t[$]19",-"IMULL\t[$]19"
return a*n + 19*n // (a+19)n
}
func MergeMuls4(n int) int {
// amd64:"IMULQ\t[$]14"
// 386:"IMULL\t[$]14"
return 23*n - 9*n // 14n
}
func MergeMuls5(a, n int) int {
// amd64:"ADDQ\t[$]-19",-"IMULQ\t[$]19"
// 386:"ADDL\t[$]-19",-"IMULL\t[$]19"
return a*n - 19*n // (a-19)n
}