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b996d4509f
Add an expander for isfinite using integer arithmetic. This is
typically faster and avoids generating spurious exceptions on
signaling NaNs. This fixes part of PR66462.
int isfinite1 (float x) { return __builtin_isfinite (x); }
Before:
fabs s0, s0
mov w0, 2139095039
fmov s31, w0
fcmp s0, s31
cset w0, hi
eor w0, w0, 1
ret
After:
fmov w1, s0
mov w0, -16777216
cmp w0, w1, lsl 1
cset w0, hi
ret
gcc:
PR middle-end/66462
* config/aarch64/aarch64.md (isfinite<mode>2): Add new expander.
gcc/testsuite:
PR middle-end/66462
* gcc.target/aarch64/pr66462.c: Add tests for isfinite.
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