From 301ca121be1faca472f5641a889823840323733f Mon Sep 17 00:00:00 2001
From: clc5q <clc5q@git.zephyr-software.com>
Date: Wed, 2 Dec 2015 16:38:31 +0000
Subject: [PATCH] Add x86-64 caller-saved regs to return statement USE lists.
Former-commit-id: 60cf80ed5cf437754a2a53f91c79a3ef97d030b5
---
src/base/SMPInstr.cpp | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/src/base/SMPInstr.cpp b/src/base/SMPInstr.cpp
index 21ece228..1cc34835 100644
--- a/src/base/SMPInstr.cpp
+++ b/src/base/SMPInstr.cpp
@@ -5572,14 +5572,19 @@ void SMPInstr::MDFixupDefUseLists(void) {
// in order to prevent erroneous analyses of dead registers or unused
// metadata.
if ((this->type == RETURN) || this->IsTailCall()) {
- this->MDAddRegUse(STARS_x86_R_ax, false);
+ // We want to add the caller-saved registers to the USEs list
+ for (list<uint16_t>::iterator RegIter = global_STARS_program->GetFirstCallerSavedReg(); RegIter != global_STARS_program->GetLastCallerSavedReg(); ++RegIter) {
+ uint16_t RegNum = (*RegIter);
+ this->MDAddRegUse(RegNum, false);
+ }
+
this->MDAddRegUse(STARS_x86_R_bx, false);
- this->MDAddRegUse(STARS_x86_R_cx, false);
- this->MDAddRegUse(STARS_x86_R_dx, false);
if (!UseFP)
this->MDAddRegUse(MD_FRAME_POINTER_REG, false);
- this->MDAddRegUse(STARS_x86_R_si, false);
- this->MDAddRegUse(STARS_x86_R_di, false);
+ if (global_STARS_program->GetSTARS_ISA_Bitwidth() == 32) { // already caller-saved in x86-64
+ this->MDAddRegUse(STARS_x86_R_si, false);
+ this->MDAddRegUse(STARS_x86_R_di, false);
+ }
}
// Next, add the flags register to the DEFs and USEs for those instructions that
--
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