Small optimization to sparc 64-bit copysign.

	* sysdeps/sparc/sparc64/fpu/s_copysign.S (__copysign): Use fzeros/fnegs
	to load 0x80000000 into a float register instead of using the stack.
	* sysdeps/sparc/sparc64/fpu/s_copysignf.S (__copysignf): Likewise.

diff --git a/ChangeLog b/ChangeLog
index 83d5d2b..4983816 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-03-14  David S. Miller  <davem@davemloft.net>
+
+       * sysdeps/sparc/sparc64/fpu/s_copysign.S (__copysign): Use fzeros/fnegs
+       to load 0x80000000 into a float register instead of using the stack.
+       * sysdeps/sparc/sparc64/fpu/s_copysignf.S (__copysignf): Likewise.
+
 2012-03-14  Joseph Myers  <joseph@codesourcery.com>
 
        * sysdeps/unix/sysv/linux/Makefile (sysdep_headers): Add

diff --git a/sysdeps/sparc/sparc64/fpu/s_copysign.S b/sysdeps/sparc/sparc64/fpu/s_copysign.S
index 571f57c..f7f69fb 100644 (file)
--- a/sysdeps/sparc/sparc64/fpu/s_copysign.S
+++ b/sysdeps/sparc/sparc64/fpu/s_copysign.S
@@ -20,9 +20,8 @@
 #include <sysdep.h>
 
 ENTRY (__copysign)
-       sethi   %hi(0x80000000), %g1
-       st      %g1, [%sp + STACK_BIAS + 128]
-       ld      [%sp + STACK_BIAS + 128], %f7
+       fzeros  %f7
+       fnegs   %f7, %f7
        fands   %f2, %f7, %f9
        fandnot2s %f0, %f7, %f0
        retl

diff --git a/sysdeps/sparc/sparc64/fpu/s_copysignf.S b/sysdeps/sparc/sparc64/fpu/s_copysignf.S
index db6a384..85577a7 100644 (file)
--- a/sysdeps/sparc/sparc64/fpu/s_copysignf.S
+++ b/sysdeps/sparc/sparc64/fpu/s_copysignf.S
@@ -20,9 +20,8 @@
 #include <sysdep.h>
 
 ENTRY (__copysignf)
-       sethi   %hi(0x80000000), %g1
-       st      %g1, [%sp + STACK_BIAS + 128]
-       ld      [%sp + STACK_BIAS + 128], %f7
+       fzeros  %f7
+       fnegs   %f7, %f7
        fands   %f3, %f7, %f9
        fandnot2s %f1, %f7, %f1
        retl