[PATCH] Fix trampolines search code for conditional branches

Max Filippov jcmvbkbc@gmail.com
Tue Nov 25 19:55:00 GMT 2014


For conditional branches that need more than one trampoline to reach its
target assembler couldn't always find suitable trampoline because
post-loop condition check was placed inside the loop, resulting in
premature loop termination. Move check outside the loop.

This fixes the following build errors seen when assembling huge files
produced by gcc:
    Error: jump target out of range; no usable trampoline found
    Error: operand 1 of 'j' has out of range value '307307'

2014-11-25  Max Filippov  <jcmvbkbc@gmail.com>

gas/
	* config/tc-xtensa.c (search_trampolines): Move post-loop
	condition check outside the search loop.

gas/testsuite/
	* gas/xtensa/trampoline.d: Add expected output for branches.
	* gas/xtensa/trampoline.s: Add test case for branches.
---
 gas/config/tc-xtensa.c                | 8 ++++----
 gas/testsuite/gas/xtensa/trampoline.d | 9 +++++++++
 gas/testsuite/gas/xtensa/trampoline.s | 7 +++++++
 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/gas/config/tc-xtensa.c b/gas/config/tc-xtensa.c
index d11b0c7..f23ccf8 100644
--- a/gas/config/tc-xtensa.c
+++ b/gas/config/tc-xtensa.c
@@ -9514,11 +9514,11 @@ search_trampolines (TInsn *tinsn, fragS *fragP, bfd_boolean unreachable_only)
 	      if (next_addr == 0 || addr - next_addr > J_RANGE)
 		break;
 	    }
-	  if (abs (addr - this_addr) < J_RANGE)
-	    return tf;
-
-	  return NULL;
 	}
+      if (abs (addr - this_addr) < J_RANGE)
+	return tf;
+
+      return NULL;
     }
   for ( ; tf; tf = tf->next)
     {
diff --git a/gas/testsuite/gas/xtensa/trampoline.d b/gas/testsuite/gas/xtensa/trampoline.d
index b4f65dc..5ae32a6 100644
--- a/gas/testsuite/gas/xtensa/trampoline.d
+++ b/gas/testsuite/gas/xtensa/trampoline.d
@@ -24,3 +24,12 @@
 .*33462:.*j.0x49407
 #...
 .*49407:.*j.0x49407
+.*4940a:.*beqz.n.a2,.0x4940f
+.*4940c:.*j.0x693d1
+#...
+.*693d1:.*j.0x7ddd4
+#...
+.*7ddd4:.*j.0x927f5
+#...
+.*927f5:.*j.0x927f5
+#...
diff --git a/gas/testsuite/gas/xtensa/trampoline.s b/gas/testsuite/gas/xtensa/trampoline.s
index 259a3bb..4465786 100644
--- a/gas/testsuite/gas/xtensa/trampoline.s
+++ b/gas/testsuite/gas/xtensa/trampoline.s
@@ -19,3 +19,10 @@
 	.endr
 3:
 	j	3b
+	bnez	a2, 4f
+	.rep	50000
+	and	a2, a2, a3
+	_ret
+	.endr
+4:
+	j	4b
-- 
1.8.1.4



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