From 6d80a8545be028be5d341b98f4619ab09178c2ea Mon Sep 17 00:00:00 2001
From: Eric Botcazou <ebotcazou@multimania.com>
Date: Mon, 15 Jul 2002 23:59:02 +0000
Subject: [PATCH] re PR middle-end/7153 (bad operands for 'movsbl' error)
PR optimization/7153
* regmove.c (optimize_reg_copy_3): Don't optimize if the register
dies in more than one insn.
From-SVN: r55468
---
gcc/ChangeLog | 6 +++++
gcc/regmove.c | 1 +
.../gcc.c-torture/compile/20020715-1.c | 22 +++++++++++++++++++
3 files changed, 29 insertions(+)
create mode 100644 gcc/testsuite/gcc.c-torture/compile/20020715-1.c
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f1e8b3ac929c..5c659805be5f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2002-07-15 Eric Botcazou <ebotcazou@multimania.com>
+
+ PR optimization/7153
+ * regmove.c (optimize_reg_copy_3): Don't optimize if the register
+ dies in more than one insn.
+
2002-07-15 Jason Thorpe <thorpej@wasabisystems.com>
* config/sparc/netbsd-elf.h (TRANSFER_FROM_TRAMPOLINE): Remove.
diff --git a/gcc/regmove.c b/gcc/regmove.c
index 55a31dc612ea..1a1fffe09752 100644
--- a/gcc/regmove.c
+++ b/gcc/regmove.c
@@ -664,6 +664,7 @@ optimize_reg_copy_3 (insn, dest, src)
if (src_no < FIRST_PSEUDO_REGISTER
|| dst_no < FIRST_PSEUDO_REGISTER
|| ! find_reg_note (insn, REG_DEAD, src_reg)
+ || REG_N_DEATHS (src_no) != 1
|| REG_N_SETS (src_no) != 1)
return;
for (p = PREV_INSN (insn); p && ! reg_set_p (src_reg, p); p = PREV_INSN (p))
diff --git a/gcc/testsuite/gcc.c-torture/compile/20020715-1.c b/gcc/testsuite/gcc.c-torture/compile/20020715-1.c
new file mode 100644
index 000000000000..5294133f37b0
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/compile/20020715-1.c
@@ -0,0 +1,22 @@
+/* PR optimization/7153 */
+/* Verify that GCC doesn't promote a register when its
+ lifetime is not limited to one basic block. */
+
+void f(char);
+void g(void);
+
+void scale(void)
+{
+ int width;
+ char bytes;
+ char *src;
+
+ if (width)
+ {
+ bytes = *src;
+ g();
+ width *= bytes;
+ }
+
+ f(bytes);
+}
--
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