MIPS: Fix compilation under clang.

Clang is a little more picky than gcc on unused variable
warnings, which become errors with -Werror. Clean up
these cases for mips.

BUG=
TEST=

Review URL: https://codereview.chromium.org/11175005
Patch from Akos Palfi <palfia@homejinni.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12748 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

diff --git a/src/mips/assembler-mips.h b/src/mips/assembler-mips.h
index ee4daad..6ee21c2 100644 (file)
--- a/src/mips/assembler-mips.h
+++ b/src/mips/assembler-mips.h
@@ -318,12 +318,15 @@ const FPURegister f31 = { 31 };
 
 // Register aliases.
 // cp is assumed to be a callee saved register.
-static const Register& kLithiumScratchReg = s3;  // Scratch register.
-static const Register& kLithiumScratchReg2 = s4;  // Scratch register.
-static const Register& kRootRegister = s6;  // Roots array pointer.
-static const Register& cp = s7;     // JavaScript context pointer.
-static const DoubleRegister& kLithiumScratchDouble = f30;
-static const FPURegister& kDoubleRegZero = f28;
+// Defined using #define instead of "static const Register&" because Clang
+// complains otherwise when a compilation unit that includes this header
+// doesn't use the variables.
+#define kRootRegister s6
+#define cp s7
+#define kLithiumScratchReg s3
+#define kLithiumScratchReg2 s4
+#define kLithiumScratchDouble f30
+#define kDoubleRegZero f28
 
 // FPU (coprocessor 1) control registers.
 // Currently only FCSR (#31) is implemented.

diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 4015bff..4a6a1fd 100644 (file)
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -1829,12 +1829,11 @@ LInstruction* LChunkBuilder::DoLoadKeyedFastDoubleElement(
 LInstruction* LChunkBuilder::DoLoadKeyedSpecializedArrayElement(
     HLoadKeyedSpecializedArrayElement* instr) {
   ElementsKind elements_kind = instr->elements_kind();
-  Representation representation(instr->representation());
   ASSERT(
-      (representation.IsInteger32() &&
+      (instr->representation().IsInteger32() &&
        (elements_kind != EXTERNAL_FLOAT_ELEMENTS) &&
        (elements_kind != EXTERNAL_DOUBLE_ELEMENTS)) ||
-      (representation.IsDouble() &&
+      (instr->representation().IsDouble() &&
        ((elements_kind == EXTERNAL_FLOAT_ELEMENTS) ||
        (elements_kind == EXTERNAL_DOUBLE_ELEMENTS))));
   ASSERT(instr->key()->representation().IsInteger32() ||
@@ -1897,13 +1896,12 @@ LInstruction* LChunkBuilder::DoStoreKeyedFastDoubleElement(
 
 LInstruction* LChunkBuilder::DoStoreKeyedSpecializedArrayElement(
     HStoreKeyedSpecializedArrayElement* instr) {
-  Representation representation(instr->value()->representation());
   ElementsKind elements_kind = instr->elements_kind();
   ASSERT(
-      (representation.IsInteger32() &&
+      (instr->value()->representation().IsInteger32() &&
        (elements_kind != EXTERNAL_FLOAT_ELEMENTS) &&
        (elements_kind != EXTERNAL_DOUBLE_ELEMENTS)) ||
-      (representation.IsDouble() &&
+      (instr->value()->representation().IsDouble() &&
        ((elements_kind == EXTERNAL_FLOAT_ELEMENTS) ||
        (elements_kind == EXTERNAL_DOUBLE_ELEMENTS))));
   ASSERT(instr->external_pointer()->representation().IsExternal());