4fc498d89a
Eliminates stores of values that have just been loaded from the same
location. Handles the common case where there are up to 3 intermediate
stores to non-overlapping struct fields.
For example the loads and stores of x.a, x.b and x.d in the following
function are now removed:
type T struct {
a, b, c, d int
}
func f(x *T) {
y := *x
y.c += 8
*x = y
}
Before this CL (s390x):
TEXT "".f(SB)
MOVD "".x(R15), R5
MOVD (R5), R1
MOVD 8(R5), R2
MOVD 16(R5), R0
MOVD 24(R5), R4
ADD $8, R0, R3
STMG R1, R4, (R5)
RET
After this CL (s390x):
TEXT "".f(SB)
MOVD "".x(R15), R1
MOVD 16(R1), R0
ADD $8, R0, R0
MOVD R0, 16(R1)
RET
In total these rules are triggered ~5091 times during all.bash,
which is broken down as:
Intermediate stores | Triggered
--------------------+----------
0 | 1434
1 | 2508
2 | 888
3 | 261
--------------------+----------
Change-Id: Ia4721ae40146aceec1fdd3e65b0e9283770bfba5
Reviewed-on: https://go-review.googlesource.com/38793
Run-TryBot: Michael Munday <munday@ca.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
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| AUTHORS | ||
| CONTRIBUTING.md | ||
| CONTRIBUTORS | ||
| favicon.ico | ||
| LICENSE | ||
| PATENTS | ||
| README.md | ||
| robots.txt | ||
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