e94e6ee495
> Richard suggests that we implement the "obvious" transforms like
> inversion in the middle-end but if for example unsigned compares
> are not supported the us_minus + eq + negative trick isn't on
> that list.
>
> The main reason to restrict vec_cmp would be to avoid
> a <= b ? c : d going with an unsupported vec_cmp but instead
> do a > b ? d : c - the alternative is trying to fix this
> on the RTL side via combine. I understand the non-native
Yes, I have a patch which can fix most regressions via pattern match
in combine.
Still there is a situation that is difficult to deal with, mainly the
optimization w/o sse4.1 . Because pblendvb/blendvps/blendvpd only
exists under sse4.1, w/o sse4.1, it takes 3
instructions (pand,pandn,por) to simulate the vcond_mask, and the
combine matches up to 4 instructions, which makes it currently
impossible to use the combine to recover those optimizations in the
vcond{,u,eq}.i.e min/max.
In the case of sse 4.1 and above, there is basically no regression anymore.
the regression testcases w/o sse4.1
FAIL: g++.target/i386/pr100637-1b.C -std=gnu++14 scan-assembler-times pcmpeqb 2
FAIL: g++.target/i386/pr100637-1b.C -std=gnu++17 scan-assembler-times pcmpeqb 2
FAIL: g++.target/i386/pr100637-1b.C -std=gnu++20 scan-assembler-times pcmpeqb 2
FAIL: g++.target/i386/pr100637-1b.C -std=gnu++98 scan-assembler-times pcmpeqb 2
FAIL: g++.target/i386/pr100637-1w.C -std=gnu++14 scan-assembler-times pcmpeqw 2
FAIL: g++.target/i386/pr100637-1w.C -std=gnu++17 scan-assembler-times pcmpeqw 2
FAIL: g++.target/i386/pr100637-1w.C -std=gnu++20 scan-assembler-times pcmpeqw 2
FAIL: g++.target/i386/pr100637-1w.C -std=gnu++98 scan-assembler-times pcmpeqw 2
FAIL: g++.target/i386/pr103861-1.C -std=gnu++14 scan-assembler-times pcmpeqb 2
FAIL: g++.target/i386/pr103861-1.C -std=gnu++17 scan-assembler-times pcmpeqb 2
FAIL: g++.target/i386/pr103861-1.C -std=gnu++20 scan-assembler-times pcmpeqb 2
FAIL: g++.target/i386/pr103861-1.C -std=gnu++98 scan-assembler-times pcmpeqb 2
FAIL: gcc.target/i386/pr88540.c scan-assembler minpd
gcc/testsuite/ChangeLog:
PR target/115517
* g++.target/i386/pr100637-1b.C: Add xfail and -mno-sse4.1.
* g++.target/i386/pr100637-1w.C: Ditto.
* g++.target/i386/pr103861-1.C: Ditto.
* gcc.target/i386/pr88540.c: Ditto.
* gcc.target/i386/pr103941-2.c: Add -mno-avx512f.
* g++.target/i386/sse4_1-pr100637-1b.C: New test.
* g++.target/i386/sse4_1-pr100637-1w.C: New test.
* g++.target/i386/sse4_1-pr103861-1.C: New test.
* gcc.target/i386/sse4_1-pr88540.c: New test.
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