Switch to llvm::findFirstSet instead of ffs since mingw doesn't have ffs.

ffs() vs findFirstSet() are slightly different, indexing is 0-based instead of 1-based. Example mingw error: http://build.chromium.org/p/tryserver.nacl/builders/nacl-toolchain-win7-pnacl-x86_64/builds/1920/steps/llvm_i686_w64_mingw32%20%28build%29/logs/stdio BUG=none R=stichnot@chromium.org Review URL: https://codereview.chromium.org/563303002

Switch to llvm::findFirstSet instead of ffs since mingw doesn't have ffs.
1eb3a55d · Jan Voung · 5ee234a7 · 1eb3a55d
Commit 1eb3a55d authored Sep 12, 2014 by Jan Voung
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IceTargetLoweringX8632.cpp src/IceTargetLoweringX8632.cpp +2 -3

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--- a/src/IceTargetLoweringX8632.cpp
+++ b/src/IceTargetLoweringX8632.cpp
@@ -24,10 +24,9 @@
 #include "IceTargetLoweringX8632.def"
 #include "IceTargetLoweringX8632.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/Support/MathExtras.h"
 #include "llvm/Support/CommandLine.h"
-#include <strings.h>
 namespace Ice {
 namespace {
@@ -557,7 +556,7 @@ void TargetX8632::sortByAlignment(VarList &Dest, const VarList &Source) const {
       ++I) {
    Variable *Var = *I;
    uint32_t NaturalAlignment = typeWidthInBytesOnStack(Var->getType());
-    SizeT LogNaturalAlignment = ffs(NaturalAlignment) - 1;
+    SizeT LogNaturalAlignment = llvm::findFirstSet(NaturalAlignment);
    assert(LogNaturalAlignment >= X86_LOG2_OF_MIN_STACK_SLOT_SIZE);
    assert(LogNaturalAlignment <= X86_LOG2_OF_MAX_STACK_SLOT_SIZE);
    SizeT BucketIndex = LogNaturalAlignment - X86_LOG2_OF_MIN_STACK_SLOT_SIZE;