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authorAdhemerval Zanella <azanella@linux.vnet.ibm.com>2015-01-27 13:16:39 -0500
committerAdhemerval Zanella <azanella@linux.vnet.ibm.com>2015-01-28 05:59:16 -0500
commit08cee2a464f614a6d4275b5af6c52481f1aa16e6 (patch)
treee0a0b946ed40ac3c884db74de69b7cf291194808 /sysdeps/powerpc/fpu/e_sqrtf.c
parent5fe8e3597562ac8e0e3df1399ebf804f72e7f661 (diff)
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powerpc: Fix fsqrt build in libm [BZ#16576]
Some powerpc64 processors (e5500 core for instance) does not provide the
fsqrt instruction, however current check to use in math_private.h is
__WORDSIZE and _ARCH_PWR4 (ISA 2.02).  This is patch change it to use
the compiler flag _ARCH_PPCSQ (which is the same condition GCC uses to
decide whether to generate fsqrt instruction).

It fixes BZ#16576.
Diffstat (limited to 'sysdeps/powerpc/fpu/e_sqrtf.c')
-rw-r--r--sysdeps/powerpc/fpu/e_sqrtf.c17
1 files changed, 7 insertions, 10 deletions
diff --git a/sysdeps/powerpc/fpu/e_sqrtf.c b/sysdeps/powerpc/fpu/e_sqrtf.c
index 5cf47f707e..034b6f58ca 100644
--- a/sysdeps/powerpc/fpu/e_sqrtf.c
+++ b/sysdeps/powerpc/fpu/e_sqrtf.c
@@ -24,6 +24,7 @@
 #include <sysdep.h>
 #include <ldsodefs.h>
 
+#ifndef _ARCH_PPCSQ
 static const float almost_half = 0.50000006;	/* 0.5 + 2^-24 */
 static const ieee_float_shape_type a_nan = {.word = 0x7fc00000 };
 static const ieee_float_shape_type a_inf = {.word = 0x7f800000 };
@@ -128,6 +129,7 @@ __slow_ieee754_sqrtf (float x)
     }
   return f_washf (x);
 }
+#endif /* _ARCH_PPCSQ  */
 
 #undef __ieee754_sqrtf
 float
@@ -135,16 +137,11 @@ __ieee754_sqrtf (float x)
 {
   double z;
 
-  /* If the CPU is 64-bit we can use the optional FP instructions.  */
-  if (__CPU_HAS_FSQRT)
-    {
-      /* Volatile is required to prevent the compiler from moving the
-	 fsqrt instruction above the branch.  */
-      __asm __volatile ("	fsqrts	%0,%1\n"
-				:"=f" (z):"f" (x));
-    }
-  else
-    z = __slow_ieee754_sqrtf (x);
+#ifdef _ARCH_PPCSQ
+  asm ("fsqrts	%0,%1\n" :"=f" (z):"f" (x));
+#else
+  z = __slow_ieee754_sqrtf (x);
+#endif
 
   return z;
 }