From 18938c299c0923e7034e8bfc5b250ded3b0ef78a Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Thu, 23 Apr 2015 06:21:49 -0400
Subject: [PATCH] fix regression in x86_64 math asm with old binutils

the implicit-operand form of fucomip is rejected by binutils 2.19 and
perhaps other versions still in use. writing both operands explicitly
fixes the issue. there is no change to the resulting output.

commit a732e80d33b4fd6f510f7cec4f5573ef5d89bc4e was the source of this
regression.
---
 src/math/x32/exp2l.s    | 6 +++---
 src/math/x86_64/exp2l.s | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/src/math/x32/exp2l.s b/src/math/x32/exp2l.s
index dfb2bc7c..e9edb96f 100644
--- a/src/math/x32/exp2l.s
+++ b/src/math/x32/exp2l.s
@@ -6,7 +6,7 @@ expm1l:
 	fmulp
 	movl $0xc2820000,-4(%esp)
 	flds -4(%esp)
-	fucomip %st(1)
+	fucomip %st(1),%st
 	fld1
 	jb 1f
 		# x*log2e <= -65, return -1 without underflow
@@ -15,7 +15,7 @@ expm1l:
 	ret
 1:	fld %st(1)
 	fabs
-	fucomip %st(1)
+	fucomip %st(1),%st
 	fstp %st(0)
 	ja 1f
 	f2xm1
@@ -48,7 +48,7 @@ exp2l:
 	fld %st(1)
 	fsub %st(1)
 	faddp
-	fucomip %st(1)
+	fucomip %st(1),%st
 	je 2f             # x - 0x1p63 + 0x1p63 == x
 	movl $1,(%esp)
 	flds (%esp)       # 0x1p-149
diff --git a/src/math/x86_64/exp2l.s b/src/math/x86_64/exp2l.s
index 0e9bdf9f..effab2bd 100644
--- a/src/math/x86_64/exp2l.s
+++ b/src/math/x86_64/exp2l.s
@@ -6,7 +6,7 @@ expm1l:
 	fmulp
 	movl $0xc2820000,-4(%rsp)
 	flds -4(%rsp)
-	fucomip %st(1)
+	fucomip %st(1),%st
 	fld1
 	jb 1f
 		# x*log2e <= -65, return -1 without underflow
@@ -15,7 +15,7 @@ expm1l:
 	ret
 1:	fld %st(1)
 	fabs
-	fucomip %st(1)
+	fucomip %st(1),%st
 	fstp %st(0)
 	ja 1f
 	f2xm1
@@ -48,7 +48,7 @@ exp2l:
 	fld %st(1)
 	fsub %st(1)
 	faddp
-	fucomip %st(1)
+	fucomip %st(1),%st
 	je 2f             # x - 0x1p63 + 0x1p63 == x
 	movl $1,(%rsp)
 	flds (%rsp)       # 0x1p-149
-- 
2.25.1