From: Joseph Myers Date: Wed, 25 May 2016 16:53:23 +0000 (+0000) Subject: Do not raise "inexact" from powerpc32 ceil, floor, trunc (bug 15479). X-Git-Tag: glibc-2.24~198 X-Git-Url: https://sourceware.org/git/?a=commitdiff_plain;h=1f921a93e4fd0b5ccd18a3e7d5a0511bcd2464fa;p=glibc.git Do not raise "inexact" from powerpc32 ceil, floor, trunc (bug 15479). Continuing fixes for ceil, floor and trunc functions not to raise the "inexact" exception, this patch fixes the versions used on older powerpc32 processors. As was done with the round implementations some time ago, the save of floating-point state is moved after the first floating-point operation on the input to ensure that any "invalid" exception from signaling NaN input is included in the saved state, and then the whole state gets restored rather than just the rounding mode. This has no effect on configurations using the power5+ code, since such processors can do these operations with a single instruction (and those instructions do not set "inexact", so are correct for TS 18661-1 semantics). Tested for powerpc32. [BZ #15479] * sysdeps/powerpc/powerpc32/fpu/s_ceil.S (__ceil): Move save of floating-point state after first floating-point operation on input. Restore full floating-point state instead of just rounding mode. * sysdeps/powerpc/powerpc32/fpu/s_ceilf.S (__ceilf): Likewise. * sysdeps/powerpc/powerpc32/fpu/s_floor.S (__floor): Likewise. * sysdeps/powerpc/powerpc32/fpu/s_floorf.S (__floorf): Likewise. * sysdeps/powerpc/powerpc32/fpu/s_trunc.S (__trunc): Likewise. * sysdeps/powerpc/powerpc32/fpu/s_truncf.S (__truncf): Likewise. --- diff --git a/ChangeLog b/ChangeLog index 1ecd6d5ab9..4564571809 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,16 @@ +2016-05-25 Joseph Myers + + [BZ #15479] + * sysdeps/powerpc/powerpc32/fpu/s_ceil.S (__ceil): Move save of + floating-point state after first floating-point operation on + input. Restore full floating-point state instead of just rounding + mode. + * sysdeps/powerpc/powerpc32/fpu/s_ceilf.S (__ceilf): Likewise. + * sysdeps/powerpc/powerpc32/fpu/s_floor.S (__floor): Likewise. + * sysdeps/powerpc/powerpc32/fpu/s_floorf.S (__floorf): Likewise. + * sysdeps/powerpc/powerpc32/fpu/s_trunc.S (__trunc): Likewise. + * sysdeps/powerpc/powerpc32/fpu/s_truncf.S (__truncf): Likewise. + 2016-05-25 Stefan Liebler [BZ #19727] diff --git a/sysdeps/powerpc/powerpc32/fpu/s_ceil.S b/sysdeps/powerpc/powerpc32/fpu/s_ceil.S index 48d6d0de19..07d031e22e 100644 --- a/sysdeps/powerpc/powerpc32/fpu/s_ceil.S +++ b/sysdeps/powerpc/powerpc32/fpu/s_ceil.S @@ -26,7 +26,6 @@ .section ".text" ENTRY (__ceil) - mffs fp11 /* Save current FPU rounding mode. */ #ifdef SHARED mflr r11 cfi_register(lr,r11) @@ -42,6 +41,8 @@ ENTRY (__ceil) fabs fp0,fp1 fsub fp12,fp13,fp13 /* generate 0.0 */ fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */ + mffs fp11 /* Save current FPU rounding mode and + "inexact" state. */ fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ bnllr- cr7 mtfsfi 7,2 /* Set rounding mode toward +inf. */ @@ -50,7 +51,8 @@ ENTRY (__ceil) fsub fp1,fp1,fp13 /* x-= TWO52; */ fabs fp1,fp1 /* if (x == 0.0) */ /* x = 0.0; */ - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr .L4: bge- cr6,.L9 /* if (x < 0.0) */ @@ -59,7 +61,8 @@ ENTRY (__ceil) fnabs fp1,fp1 /* if (x == 0.0) */ /* x = -0.0; */ .L9: - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr END (__ceil) diff --git a/sysdeps/powerpc/powerpc32/fpu/s_ceilf.S b/sysdeps/powerpc/powerpc32/fpu/s_ceilf.S index c70fd444e2..3987e24e41 100644 --- a/sysdeps/powerpc/powerpc32/fpu/s_ceilf.S +++ b/sysdeps/powerpc/powerpc32/fpu/s_ceilf.S @@ -25,7 +25,6 @@ .section ".text" ENTRY (__ceilf) - mffs fp11 /* Save current FPU rounding mode. */ #ifdef SHARED mflr r11 cfi_register(lr,r11) @@ -41,6 +40,8 @@ ENTRY (__ceilf) fabs fp0,fp1 fsubs fp12,fp13,fp13 /* generate 0.0 */ fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO23) */ + mffs fp11 /* Save current FPU rounding mode and + "inexact" state. */ fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ bnllr- cr7 mtfsfi 7,2 /* Set rounding mode toward +inf. */ @@ -49,7 +50,8 @@ ENTRY (__ceilf) fsubs fp1,fp1,fp13 /* x-= TWO23; */ fabs fp1,fp1 /* if (x == 0.0) */ /* x = 0.0; */ - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr .L4: bge- cr6,.L9 /* if (x < 0.0) */ @@ -58,7 +60,8 @@ ENTRY (__ceilf) fnabs fp1,fp1 /* if (x == 0.0) */ /* x = -0.0; */ .L9: - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr END (__ceilf) diff --git a/sysdeps/powerpc/powerpc32/fpu/s_floor.S b/sysdeps/powerpc/powerpc32/fpu/s_floor.S index 3f84465a8e..b951666bd7 100644 --- a/sysdeps/powerpc/powerpc32/fpu/s_floor.S +++ b/sysdeps/powerpc/powerpc32/fpu/s_floor.S @@ -26,7 +26,6 @@ .section ".text" ENTRY (__floor) - mffs fp11 /* Save current FPU rounding mode. */ #ifdef SHARED mflr r11 cfi_register(lr,r11) @@ -42,6 +41,8 @@ ENTRY (__floor) fabs fp0,fp1 fsub fp12,fp13,fp13 /* generate 0.0 */ fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */ + mffs fp11 /* Save current FPU rounding mode and + "inexact" state. */ fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ bnllr- cr7 mtfsfi 7,3 /* Set rounding mode toward -inf. */ @@ -50,7 +51,8 @@ ENTRY (__floor) fsub fp1,fp1,fp13 /* x-= TWO52; */ fabs fp1,fp1 /* if (x == 0.0) */ /* x = 0.0; */ - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr .L4: bge- cr6,.L9 /* if (x < 0.0) */ @@ -59,7 +61,8 @@ ENTRY (__floor) fnabs fp1,fp1 /* if (x == 0.0) */ /* x = -0.0; */ .L9: - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr END (__floor) diff --git a/sysdeps/powerpc/powerpc32/fpu/s_floorf.S b/sysdeps/powerpc/powerpc32/fpu/s_floorf.S index 55ac526d71..64b87b1cc1 100644 --- a/sysdeps/powerpc/powerpc32/fpu/s_floorf.S +++ b/sysdeps/powerpc/powerpc32/fpu/s_floorf.S @@ -25,7 +25,6 @@ .section ".text" ENTRY (__floorf) - mffs fp11 /* Save current FPU rounding mode. */ #ifdef SHARED mflr r11 cfi_register(lr,r11) @@ -41,6 +40,8 @@ ENTRY (__floorf) fabs fp0,fp1 fsubs fp12,fp13,fp13 /* generate 0.0 */ fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO23) */ + mffs fp11 /* Save current FPU rounding mode and + "inexact" state. */ fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ bnllr- cr7 mtfsfi 7,3 /* Set rounding mode toward -inf. */ @@ -49,7 +50,8 @@ ENTRY (__floorf) fsubs fp1,fp1,fp13 /* x-= TWO23; */ fabs fp1,fp1 /* if (x == 0.0) */ /* x = 0.0; */ - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr .L4: bge- cr6,.L9 /* if (x < 0.0) */ @@ -58,7 +60,8 @@ ENTRY (__floorf) fnabs fp1,fp1 /* if (x == 0.0) */ /* x = -0.0; */ .L9: - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr END (__floorf) diff --git a/sysdeps/powerpc/powerpc32/fpu/s_trunc.S b/sysdeps/powerpc/powerpc32/fpu/s_trunc.S index c8aa2fb245..260b4fd336 100644 --- a/sysdeps/powerpc/powerpc32/fpu/s_trunc.S +++ b/sysdeps/powerpc/powerpc32/fpu/s_trunc.S @@ -33,7 +33,6 @@ .section ".text" ENTRY (__trunc) - mffs fp11 /* Save current FPU rounding mode. */ #ifdef SHARED mflr r11 cfi_register(lr,r11) @@ -49,6 +48,8 @@ ENTRY (__trunc) fabs fp0,fp1 fsub fp12,fp13,fp13 /* generate 0.0 */ fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO52) */ + mffs fp11 /* Save current FPU rounding mode and + "inexact" state. */ fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ bnllr- cr7 mtfsfi 7,1 /* Set rounding toward 0 mode. */ @@ -57,7 +58,8 @@ ENTRY (__trunc) fsub fp1,fp1,fp13 /* x-= TWO52; */ fabs fp1,fp1 /* if (x == 0.0) */ /* x = 0.0; */ - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr .L4: bge- cr6,.L9 /* if (x < 0.0) */ @@ -66,7 +68,8 @@ ENTRY (__trunc) fnabs fp1,fp1 /* if (x == 0.0) */ /* x = -0.0; */ .L9: - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr END (__trunc) diff --git a/sysdeps/powerpc/powerpc32/fpu/s_truncf.S b/sysdeps/powerpc/powerpc32/fpu/s_truncf.S index e47ee96c55..6c2c959e71 100644 --- a/sysdeps/powerpc/powerpc32/fpu/s_truncf.S +++ b/sysdeps/powerpc/powerpc32/fpu/s_truncf.S @@ -32,7 +32,6 @@ .section ".text" ENTRY (__truncf) - mffs fp11 /* Save current FPU rounding mode. */ #ifdef SHARED mflr r11 cfi_register(lr,r11) @@ -48,6 +47,8 @@ ENTRY (__truncf) fabs fp0,fp1 fsubs fp12,fp13,fp13 /* generate 0.0 */ fcmpu cr7,fp0,fp13 /* if (fabs(x) > TWO23) */ + mffs fp11 /* Save current FPU rounding mode and + "inexact" state. */ fcmpu cr6,fp1,fp12 /* if (x > 0.0) */ bnllr- cr7 mtfsfi 7,1 /* Set rounding toward 0 mode. */ @@ -56,7 +57,8 @@ ENTRY (__truncf) fsubs fp1,fp1,fp13 /* x-= TWO23; */ fabs fp1,fp1 /* if (x == 0.0) */ /* x = 0.0; */ - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr .L4: bge- cr6,.L9 /* if (x < 0.0) */ @@ -65,7 +67,8 @@ ENTRY (__truncf) fnabs fp1,fp1 /* if (x == 0.0) */ /* x = -0.0; */ .L9: - mtfsf 0x01,fp11 /* restore previous rounding mode. */ + mtfsf 0xff,fp11 /* Restore previous rounding mode and + "inexact" state. */ blr END (__truncf)