From 3a1944a6027742b55618cf0105e190f2023786ff Mon Sep 17 00:00:00 2001
From: Richard Earnshaw <rearnsha@arm.com>
Date: Sun, 16 Feb 2003 19:40:11 +0000
Subject: [PATCH] arm.c (arm_reload_in_hi): Ensure that the scratch register
does not overlap the final result register.
* arm.c (arm_reload_in_hi): Ensure that the scratch register does
not overlap the final result register.
From-SVN: r62981
---
gcc/ChangeLog | 5 +++++
gcc/config/arm/arm.c | 9 ++++++++-
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index a15042015653..79562ba52acb 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2003-02-16 Richard Earnshaw <rearnsha@arm.com>
+
+ * arm.c (arm_reload_in_hi): Ensure that the scratch register does
+ not overlap the final result register.
+
2003-02-16 Arend Bayer <arend.bayer@web.de>
Richard Henderson <rth@redhat.com>
diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c
index 2d4f4d891235..0847c97ae9d5 100644
--- a/gcc/config/arm/arm.c
+++ b/gcc/config/arm/arm.c
@@ -5845,7 +5845,14 @@ arm_reload_in_hi (operands)
}
}
- scratch = gen_rtx_REG (SImode, REGNO (operands[2]));
+ /* Operands[2] may overlap operands[0] (though it won't overlap
+ operands[1]), that's why we asked for a DImode reg -- so we can
+ use the bit that does not overlap. */
+ if (REGNO (operands[2]) == REGNO (operands[0]))
+ scratch = gen_rtx_REG (SImode, REGNO (operands[2]) + 1);
+ else
+ scratch = gen_rtx_REG (SImode, REGNO (operands[2]));
+
emit_insn (gen_zero_extendqisi2 (scratch,
gen_rtx_MEM (QImode,
plus_constant (base,
--
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