From 7540cfc5a8c39eca9ba7b631dd30b35f6530f54d Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Sun, 21 Jun 2015 17:48:04 +0000 Subject: Fix x86 / x86_64 expl, exp10l missing underflows (bug 16361). Similar to various other bugs in this area, the x86 and x86_64 implementations of expl / exp10l can fail to produce underflow exceptions when the unscaled result has trailing 0 bits so the scaling down to subnormal precision is exact. This patch fixes this by forcing the exception in the case of tiny results. Tested for x86_64 and x86. [BZ #16361] * sysdeps/i386/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object. [!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for tiny results. * sysdeps/x86_64/fpu/e_expl.S [!USE_AS_EXPM1L] (cmin): New object. [!USE_AS_EXPM1L] (IEEE754_EXPL): Force underflow exception for tiny results. * math/auto-libm-test-in: Add more tests of exp and exp10. Do not mark underflow exceptions as possibly missing for bug 16361. * math/auto-libm-test-out: Regenerated. --- sysdeps/x86_64/fpu/e_expl.S | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'sysdeps/x86_64') diff --git a/sysdeps/x86_64/fpu/e_expl.S b/sysdeps/x86_64/fpu/e_expl.S index 0ebe3882a5..866bad2c6e 100644 --- a/sysdeps/x86_64/fpu/e_expl.S +++ b/sysdeps/x86_64/fpu/e_expl.S @@ -65,6 +65,10 @@ c1: .byte 0x20, 0xfa, 0xee, 0xc2, 0x5f, 0x70, 0xa5, 0xec, 0xed, 0x3f csat: .byte 0, 0, 0, 0, 0, 0, 0, 0x80, 0x0e, 0x40 .byte 0, 0, 0, 0, 0, 0 ASM_SIZE_DIRECTIVE(csat) + .type cmin,@object +cmin: .byte 0, 0, 0, 0, 0, 0, 0, 0x80, 0x1, 0 + .byte 0, 0, 0, 0, 0, 0 + ASM_SIZE_DIRECTIVE(cmin) #endif #ifdef PIC @@ -182,8 +186,17 @@ ENTRY(IEEE754_EXPL) fstp %st(1) /* 2 */ fscale /* 2 scale factor is st(1); base^x */ fstp %st(1) /* 1 */ + /* Ensure underflow for tiny result. */ + fldt MO(cmin) /* 2 cmin */ + fld %st(1) /* 3 */ + fcomip %st(1), %st /* 2 */ + fstp %st /* 1 */ + jnc 6f + fld %st + fmul %st + fstp %st #endif - fstp %st(1) /* 0 */ +6: fstp %st(1) /* 0 */ jmp 2f 1: #ifdef USE_AS_EXPM1L -- cgit 1.4.1