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Fix expm1 spurious underflow exceptions (bug 6778).
This commit is contained in:
Joseph Myers
parent
fb21f89b75
commit
f17ac40d7c
21
ChangeLog
21
ChangeLog
@ -1,3 +1,24 @@
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2012-07-06 Joseph Myers <joseph@codesourcery.com>
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[BZ #6778]
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* sysdeps/i386/fpu/s_expm1.S (__expm1): Check for large negative
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inputs and return -1 for them. Do not check for +Inf in case not
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reachable for +Inf.
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* sysdeps/i386/fpu/s_expm1f.S (__expm1f): Likewise.
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* sysdeps/i386/fpu/e_expl.S [USE_AS_EXPM1L] (csat): Do not define.
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(IEEE754_EXPL) [USE_AS_EXPM1L]: Check for large negative inputs
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and return -1 for them. Do not check for +Inf in case not
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reachable for +Inf.
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* sysdeps/x86_64/fpu/e_expl.S [USE_AS_EXPM1L] (csat): Do not
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define.
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(IEEE754_EXPL) [USE_AS_EXPM1L]: Check for large negative inputs
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and return -1 for them. Do not check for +Inf in case not
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reachable for +Inf.
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* math/libm-test.inc (expm1_test): Add more tests. Do not allow
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spurious underflow.
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* sysdeps/i386/fpu/libm-test-ulps: Update.
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* sysdeps/x86_64/fpu/libm-test-ulps: Likewise.
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2012-07-06 Mike Frysinger <vapier@gentoo.org>
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* sunrpc/rpc_clntout.c: Change <rpc/types.h> to "rpc/types.h".
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2
NEWS
2
NEWS
@ -9,7 +9,7 @@ Version 2.17
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* The following bugs are resolved with this release:
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14157, 14283, 14328, 14331
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6778, 14157, 14283, 14328, 14331
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Version 2.16
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@ -4039,12 +4039,32 @@ expm1_test (void)
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TEST_f_f (expm1, 11356.25L, 9.05128237311923300051376115753226014206e+4931L);
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#endif
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TEST_f_f (expm1, -10.0, -0.9999546000702375151484644084844394493898L);
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TEST_f_f (expm1, -16.0, -0.9999998874648252807408854862248209398728L);
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TEST_f_f (expm1, -17.0, -0.9999999586006228121483334034897228104472L);
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TEST_f_f (expm1, -18.0, -0.9999999847700202552873715638633707664826L);
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TEST_f_f (expm1, -36.0, -0.9999999999999997680477169756430611687736L);
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TEST_f_f (expm1, -37.0, -0.9999999999999999146695237425593420572195L);
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TEST_f_f (expm1, -38.0, -0.9999999999999999686086720795197037129104L);
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TEST_f_f (expm1, -44.0, -0.9999999999999999999221886775886620348429L);
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TEST_f_f (expm1, -45.0, -0.9999999999999999999713748141945060635553L);
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TEST_f_f (expm1, -46.0, -0.9999999999999999999894693826424461876212L);
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TEST_f_f (expm1, -73.0, -0.9999999999999999999999999999999802074012L);
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TEST_f_f (expm1, -74.0, -0.9999999999999999999999999999999927187098L);
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TEST_f_f (expm1, -75.0, -0.9999999999999999999999999999999973213630L);
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TEST_f_f (expm1, -78.0, -0.9999999999999999999999999999999998666385L);
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TEST_f_f (expm1, -79.0, -0.9999999999999999999999999999999999509391L);
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TEST_f_f (expm1, -80.0, -0.9999999999999999999999999999999999819515L);
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TEST_f_f (expm1, -100.0, -1.0);
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TEST_f_f (expm1, -1000.0, -1.0);
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TEST_f_f (expm1, -10000.0, -1.0);
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TEST_f_f (expm1, -100000.0, -1.0);
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errno = 0;
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TEST_f_f (expm1, 100000.0, plus_infty, OVERFLOW_EXCEPTION);
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check_int ("errno for expm1(large) == ERANGE", errno, ERANGE, 0, 0, 0);
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TEST_f_f (expm1, max_value, plus_infty, OVERFLOW_EXCEPTION);
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/* Bug 6778: spurious underflow exception. */
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TEST_f_f (expm1, -max_value, -1, UNDERFLOW_EXCEPTION_OK);
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TEST_f_f (expm1, -max_value, -1);
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END (expm1);
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}
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@ -60,10 +60,12 @@ c1: .byte 0x20, 0xfa, 0xee, 0xc2, 0x5f, 0x70, 0xa5, 0xec, 0xed, 0x3f
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.byte 0, 0, 0, 0, 0, 0
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ASM_SIZE_DIRECTIVE(c1)
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#endif
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#ifndef USE_AS_EXPM1L
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ASM_TYPE_DIRECTIVE(csat,@object)
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csat: .byte 0, 0, 0, 0, 0, 0, 0, 0x80, 0x0e, 0x40
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.byte 0, 0, 0, 0, 0, 0
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ASM_SIZE_DIRECTIVE(csat)
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#endif
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#ifdef PIC
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# define MO(op) op##@GOTOFF(%ecx)
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@ -88,9 +90,26 @@ ENTRY(IEEE754_EXPL)
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#ifdef PIC
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LOAD_PIC_REG (cx)
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#endif
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#ifndef USE_AS_EXPM1L
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#ifdef USE_AS_EXPM1L
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xorb $0x80, %ah
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cmpl $0xc006, %eax
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fstsw %ax
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movb $0x45, %dh
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jb 4f
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/* Below -64.0 (may be -NaN or -Inf). */
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andb %ah, %dh
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cmpb $0x01, %dh
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je 2f /* Is +-NaN, jump. */
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jmp 1f /* -large, possibly -Inf. */
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4: /* In range -64.0 to 64.0 (may be +-0 but not NaN or +-Inf). */
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/* Test for +-0 as argument. */
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andb %ah, %dh
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cmpb $0x40, %dh
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je 2f
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#else
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movzwl 4+8(%esp), %eax
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#endif
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andl $0x7fff, %eax
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cmpl $0x400d, %eax
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jle 3f
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@ -108,16 +127,8 @@ ENTRY(IEEE754_EXPL)
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andb $2, %ah
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jz 3f
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fchs
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3:
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#ifdef USE_AS_EXPM1L
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/* Test for +-0 as argument. */
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fstsw %ax
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movb $0x45, %dh
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andb %ah, %dh
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cmpb $0x40, %dh
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je 2f
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#endif
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FLDLOG /* 1 log2(base) */
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3: FLDLOG /* 1 log2(base) */
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fmul %st(1), %st /* 1 x log2(base) */
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frndint /* 1 i */
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fld %st(1) /* 2 x */
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@ -154,13 +165,16 @@ ENTRY(IEEE754_EXPL)
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#endif
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fstp %st(1) /* 0 */
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jmp 2f
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1: testl $0x200, %eax /* Test sign. */
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jz 2f /* If positive, jump. */
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fstp %st
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1:
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#ifdef USE_AS_EXPM1L
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/* For expm1l, only negative sign gets here. */
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fstp %st
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fld1
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fchs
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#else
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testl $0x200, %eax /* Test sign. */
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jz 2f /* If positive, jump. */
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fstp %st
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fldz /* Set result to 0. */
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#endif
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2: ret
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@ -1779,6 +1779,9 @@ idouble: 1
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ifloat: 1
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# expm1
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Test "expm1 (-45.0) == -0.9999999999999999999713748141945060635553":
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ildouble: 1
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ldouble: 1
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Test "expm1 (1) == M_El - 1.0":
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ildouble: 1
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Test "expm1 (11356.25) == 9.05128237311923300051376115753226014206e+4931":
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@ -51,19 +51,31 @@ ENTRY(__expm1)
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jae HIDDEN_JUMPTARGET (__exp)
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fldl 4(%esp) // x
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fxam // Is NaN or +-Inf?
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fxam // Is NaN, +-Inf or +-0?
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xorb $0x80, %ah
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cmpl $0xc043, %eax // is num <= -38.0?
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fstsw %ax
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movb $0x45, %ch
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jb 4f
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// Below -38.0 (may be -NaN or -Inf).
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andb %ah, %ch
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#ifdef PIC
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LOAD_PIC_REG (dx)
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#endif
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cmpb $0x01, %ch
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je 5f // If -NaN, jump.
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jmp 2f // -large, possibly -Inf.
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4: // In range -38.0 to 704.0 (may be +-0 but not NaN or +-Inf).
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andb %ah, %ch
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cmpb $0x40, %ch
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je 3f // If +-0, jump.
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#ifdef PIC
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LOAD_PIC_REG (dx)
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#endif
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cmpb $0x05, %ch
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je 2f // If +-Inf, jump.
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fldt MO(l2e) // log2(e) : x
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5: fldt MO(l2e) // log2(e) : x
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fmulp // log2(e)*x
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fld %st // log2(e)*x : log2(e)*x
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frndint // int(log2(e)*x) : log2(e)*x
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@ -79,9 +91,7 @@ ENTRY(__expm1)
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fsubrp %st, %st(1) // 2^(log2(e)*x)
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ret
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2: testl $0x200, %eax // Test sign.
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jz 3f // If positive, jump.
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fstp %st
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2: fstp %st
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fldl MO(minus1) // Set result to -1.0.
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3: ret
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END(__expm1)
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@ -51,19 +51,31 @@ ENTRY(__expm1f)
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jae HIDDEN_JUMPTARGET (__expf)
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flds 4(%esp) // x
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fxam // Is NaN or +-Inf?
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fxam // Is NaN, +-Inf or +-0?
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xorb $0x80, %ah
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cmpl $0xc190, %eax // is num <= -18.0?
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fstsw %ax
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movb $0x45, %ch
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jb 4f
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// Below -18.0 (may be -NaN or -Inf).
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andb %ah, %ch
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#ifdef PIC
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LOAD_PIC_REG (dx)
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#endif
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cmpb $0x01, %ch
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je 5f // If -NaN, jump.
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jmp 2f // -large, possibly -Inf.
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4: // In range -18.0 to 88.5 (may be +-0 but not NaN or +-Inf).
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andb %ah, %ch
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cmpb $0x40, %ch
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je 3f // If +-0, jump.
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#ifdef PIC
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LOAD_PIC_REG (dx)
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#endif
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cmpb $0x05, %ch
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je 2f // If +-Inf, jump.
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fldt MO(l2e) // log2(e) : x
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5: fldt MO(l2e) // log2(e) : x
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fmulp // log2(e)*x
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fld %st // log2(e)*x : log2(e)*x
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frndint // int(log2(e)*x) : log2(e)*x
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@ -79,9 +91,7 @@ ENTRY(__expm1f)
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fsubrp %st, %st(1) // 2^(log2(e)*x)
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ret
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2: testl $0x200, %eax // Test sign.
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jz 3f // If positive, jump.
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fstp %st
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2: fstp %st
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fldl MO(minus1) // Set result to -1.0.
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3: ret
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END(__expm1f)
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@ -60,10 +60,12 @@ c1: .byte 0x20, 0xfa, 0xee, 0xc2, 0x5f, 0x70, 0xa5, 0xec, 0xed, 0x3f
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.byte 0, 0, 0, 0, 0, 0
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ASM_SIZE_DIRECTIVE(c1)
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#endif
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#ifndef USE_AS_EXPM1L
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ASM_TYPE_DIRECTIVE(csat,@object)
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csat: .byte 0, 0, 0, 0, 0, 0, 0, 0x80, 0x0e, 0x40
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.byte 0, 0, 0, 0, 0, 0
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ASM_SIZE_DIRECTIVE(csat)
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#endif
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#ifdef PIC
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# define MO(op) op##(%rip)
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@ -85,9 +87,26 @@ ENTRY(IEEE754_EXPL)
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For the i686 the code can be written better.
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-- drepper@cygnus.com. */
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fxam /* Is NaN or +-Inf? */
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#ifndef USE_AS_EXPM1L
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#ifdef USE_AS_EXPM1L
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xorb $0x80, %ah
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cmpl $0xc006, %eax
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fstsw %ax
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movb $0x45, %dh
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jb 4f
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/* Below -64.0 (may be -NaN or -Inf). */
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andb %ah, %dh
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cmpb $0x01, %dh
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je 2f /* Is +-NaN, jump. */
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jmp 1f /* -large, possibly -Inf. */
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4: /* In range -64.0 to 64.0 (may be +-0 but not NaN or +-Inf). */
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/* Test for +-0 as argument. */
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andb %ah, %dh
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cmpb $0x40, %dh
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je 2f
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#else
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movzwl 8+8(%rsp), %eax
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#endif
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andl $0x7fff, %eax
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cmpl $0x400d, %eax
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jle 3f
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@ -105,16 +124,8 @@ ENTRY(IEEE754_EXPL)
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andb $2, %ah
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jz 3f
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fchs
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3:
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#ifdef USE_AS_EXPM1L
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/* Test for +-0 as argument. */
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fstsw %ax
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movb $0x45, %dh
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andb %ah, %dh
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cmpb $0x40, %dh
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je 2f
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#endif
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FLDLOG /* 1 log2(base) */
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3: FLDLOG /* 1 log2(base) */
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fmul %st(1), %st /* 1 x log2(base) */
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frndint /* 1 i */
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fld %st(1) /* 2 x */
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@ -151,13 +162,16 @@ ENTRY(IEEE754_EXPL)
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#endif
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fstp %st(1) /* 0 */
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jmp 2f
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1: testl $0x200, %eax /* Test sign. */
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jz 2f /* If positive, jump. */
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fstp %st
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1:
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#ifdef USE_AS_EXPM1L
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/* For expm1l, only negative sign gets here. */
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fstp %st
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fld1
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fchs
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#else
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testl $0x200, %eax /* Test sign. */
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jz 2f /* If positive, jump. */
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fstp %st
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fldz /* Set result to 0. */
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#endif
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2: ret
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@ -1657,6 +1657,9 @@ float: 1
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ifloat: 1
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# expm1
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Test "expm1 (-45.0) == -0.9999999999999999999713748141945060635553":
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ildouble: 1
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ldouble: 1
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Test "expm1 (0.75) == 1.11700001661267466854536981983709561":
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double: 1
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idouble: 1
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