From 634f1c3d4d6e9ab619f7277f964226029e70565b Mon Sep 17 00:00:00 2001
From: clc5q <clc5q@git.zephyr-software.com>
Date: Wed, 2 Dec 2015 17:40:36 +0000
Subject: [PATCH] Add x86-64 callee-saved regs to return instruction USEs
lists.
Former-commit-id: 9db9cbda545cf58b1652a33391cf9101331bc190
---
src/base/SMPInstr.cpp | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/src/base/SMPInstr.cpp b/src/base/SMPInstr.cpp
index 1cc34835..0bd82941 100644
--- a/src/base/SMPInstr.cpp
+++ b/src/base/SMPInstr.cpp
@@ -5581,10 +5581,19 @@ void SMPInstr::MDFixupDefUseLists(void) {
this->MDAddRegUse(STARS_x86_R_bx, false);
if (!UseFP)
this->MDAddRegUse(MD_FRAME_POINTER_REG, false);
- if (global_STARS_program->GetSTARS_ISA_Bitwidth() == 32) { // already caller-saved in x86-64
+ size_t BitWidth = global_STARS_program->GetSTARS_ISA_Bitwidth();
+ if (BitWidth == 32) { // already caller-saved in x86-64
this->MDAddRegUse(STARS_x86_R_si, false);
this->MDAddRegUse(STARS_x86_R_di, false);
}
+ else if (BitWidth == 64) {
+ // Add callee-saved regs R12 through R15. We can optimize these away with later analysis,
+ // after we have GlobalNames and LocalNames defined.
+ this->MDAddRegUse(STARS_x86_R_r12, false);
+ this->MDAddRegUse(STARS_x86_R_r13, false);
+ this->MDAddRegUse(STARS_x86_R_r14, false);
+ this->MDAddRegUse(STARS_x86_R_r15, false);
+ }
}
// Next, add the flags register to the DEFs and USEs for those instructions that
--
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