From: Ranjeet Singh <Ranjeet.Singh@arm.com>
Date: Wed, 24 Jun 2015 23:39:25 +0000 (+0000)
Subject: [ARM] The bits set in the variable HW_FP could get unset
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=56325ae29f728cabec6e25d72a3e12a102c73984;p=clang

[ARM] The bits set in the variable HW_FP could get unset
when iterating through the Features vector if we don't
keep track of what's already been set. This could lead to
the macro __ARM_FP getting the wrong value. This patch
fixes this issue by keeping track of the bits that have
already been set in the loop.

Differential Revision: http://reviews.llvm.org/D10395


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@240607 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp
index 11af470842..16c678e958 100644
--- a/lib/Basic/Targets.cpp
+++ b/lib/Basic/Targets.cpp
@@ -4246,6 +4246,9 @@ public:
     SoftFloat = SoftFloatABI = false;
     HWDiv = 0;
 
+    // This does not diagnose illegal cases like having both
+    // "+vfpv2" and "+vfpv3" or having "+neon" and "+fp-only-sp".
+    uint32_t HW_FP_remove = 0;
     for (const auto &Feature : Features) {
       if (Feature == "+soft-float") {
         SoftFloat = true;
@@ -4253,19 +4256,19 @@ public:
         SoftFloatABI = true;
       } else if (Feature == "+vfp2") {
         FPU |= VFP2FPU;
-        HW_FP = HW_FP_SP | HW_FP_DP;
+        HW_FP |= HW_FP_SP | HW_FP_DP;
       } else if (Feature == "+vfp3") {
         FPU |= VFP3FPU;
-        HW_FP = HW_FP_SP | HW_FP_DP;
+        HW_FP |= HW_FP_SP | HW_FP_DP;
       } else if (Feature == "+vfp4") {
         FPU |= VFP4FPU;
-        HW_FP = HW_FP_SP | HW_FP_DP | HW_FP_HP;
+        HW_FP |= HW_FP_SP | HW_FP_DP | HW_FP_HP;
       } else if (Feature == "+fp-armv8") {
         FPU |= FPARMV8;
-        HW_FP = HW_FP_SP | HW_FP_DP | HW_FP_HP;
+        HW_FP |= HW_FP_SP | HW_FP_DP | HW_FP_HP;
       } else if (Feature == "+neon") {
         FPU |= NeonFPU;
-        HW_FP = HW_FP_SP | HW_FP_DP;
+        HW_FP |= HW_FP_SP | HW_FP_DP;
       } else if (Feature == "+hwdiv") {
         HWDiv |= HWDivThumb;
       } else if (Feature == "+hwdiv-arm") {
@@ -4275,9 +4278,10 @@ public:
       } else if (Feature == "+crypto") {
         Crypto = 1;
       } else if (Feature == "+fp-only-sp") {
-        HW_FP &= ~HW_FP_DP;
+        HW_FP_remove |= HW_FP_DP | HW_FP_HP;
       }
     }
+    HW_FP &= ~HW_FP_remove;
 
     if (!(FPU & NeonFPU) && FPMath == FP_Neon) {
       Diags.Report(diag::err_target_unsupported_fpmath) << "neon";