Rebased PNaCl localmods in LLVM to 223109

test/NaCl/Bitcode/bitcast-elide.ll

Index: test/NaCl/Bitcode/bitcast-elide.ll
diff --git a/test/NaCl/Bitcode/bitcast-elide.ll b/test/NaCl/Bitcode/bitcast-elide.ll
new file mode 100644
index 0000000000000000000000000000000000000000..e1b3fbb9b88453840c1d972a700535e62deb5997
--- /dev/null
+++ b/test/NaCl/Bitcode/bitcast-elide.ll
@@ -0,0 +1,179 @@
+; Test how we handle eliding (pointer) bitcast instructions.
+
+; RUN: llvm-as < %s | pnacl-freeze  \
+; RUN:              | pnacl-bcanalyzer -dump-records \
+; RUN:              | FileCheck %s -check-prefix=PF2
+
+; RUN: llvm-as < %s | pnacl-freeze -allow-local-symbol-tables \
+; RUN:              | pnacl-thaw -allow-local-symbol-tables \
+; RUN:              | llvm-dis - | FileCheck %s -check-prefix=TD2
+
+; ------------------------------------------------------
+
+@bytes = internal global [4 x i8] c"abcd"
+
+; ------------------------------------------------------
+
+; Test that we elide the simple case of global.
+define void @SimpleLoad() {
+  %1 = bitcast [4 x i8]* @bytes to i32*
+  %2 = load i32* %1, align 4
+  ret void
+}
+
+; TD2:      define void @SimpleLoad() {
+; TD2-NEXT:   %1 = bitcast [4 x i8]* @bytes to i32*
+; TD2-NEXT:   %2 = load i32* %1, align 4
+; TD2-NEXT:   ret void
+; TD2-NEXT: }
+
+; PF2:       <FUNCTION_BLOCK>
+; PF2-NEXT:    <DECLAREBLOCKS op0=1/>
+; PF2-NEXT:    <INST_LOAD op0=1 op1=3 op2=0/>
+; PF2-NEXT:    <INST_RET/>
+; PF2-NEXT:  </FUNCTION_BLOCK>
+
+; ------------------------------------------------------
+
+; Test that we elide the simple case of an alloca.
+define void @SimpleLoadAlloca() {
+  %1 = alloca i8, i32 4, align 4
+  %2 = bitcast i8* %1 to i32*
+  %3 = load i32* %2, align 4
+  ret void
+}
+
+; TD2:      define void @SimpleLoadAlloca() {
+; TD2-NEXT:   %1 = alloca i8, i32 4, align 4
+; TD2-NEXT:   %2 = bitcast i8* %1 to i32*
+; TD2-NEXT:   %3 = load i32* %2, align 4
+; TD2-NEXT:   ret void
+; TD2-NEXT: }
+
+; PF2:        <FUNCTION_BLOCK>
+; PF2:          </CONSTANTS_BLOCK>
+; PF2-NEXT:     <INST_ALLOCA op0=1 op1=3/>
+; PF2-NEXT:     <INST_LOAD op0=1 op1=3 op2=0/>
+; PF2-NEXT:     <INST_RET/>
+; PF2-NEXT:   </FUNCTION_BLOCK>
+
+; ------------------------------------------------------
+
+; Test that we can handle multiple bitcasts.
+define i32 @TwoLoads(i32 %i) {
+  %1 = bitcast [4 x i8]* @bytes to i32*       
+  %2 = load i32* %1, align 4
+  %3 = bitcast [4 x i8]* @bytes to i32*       
+  %4 = load i32* %3, align 4
+  %5 = add i32 %2, %4
+  ret i32 %5
+}
+
+; TD2:      define i32 @TwoLoads(i32 %i) {
+; TD2-NEXT:   %1 = bitcast [4 x i8]* @bytes to i32*
+; TD2-NEXT:   %2 = load i32* %1, align 4
+; TD2-NEXT:   %3 = load i32* %1, align 4
+; TD2-NEXT:   %4 = add i32 %2, %3
+; TD2-NEXT:   ret i32 %4
+; TD2-NEXT: }
+
+; PF2:       <FUNCTION_BLOCK>
+; PF2-NEXT:    <DECLAREBLOCKS op0=1/>
+; PF2-NEXT:    <INST_LOAD op0=2 op1=3 op2=0/>
+; PF2-NEXT:    <INST_LOAD op0=3 op1=3 op2=0/>
+; PF2-NEXT:    <INST_BINOP op0=2 op1=1 op2=0/>
+; PF2-NEXT:    <INST_RET op0=1/>
+; PF2:       </FUNCTION_BLOCK>
+
+; ------------------------------------------------------
+
+; Test how we handle bitcasts if optimized in the input file.  This
+; case tests within a single block.
+define i32 @TwoLoadOptOneBlock(i32 %i) {
+  %1 = bitcast [4 x i8]* @bytes to i32*       
+  %2 = load i32* %1, align 4
+  %3 = load i32* %1, align 4
+  %4 = add i32 %2, %3
+  ret i32 %4
+}
+
+; TD2:      define i32 @TwoLoadOptOneBlock(i32 %i) {
+; TD2-NEXT:   %1 = bitcast [4 x i8]* @bytes to i32*
+; TD2-NEXT:   %2 = load i32* %1, align 4
+; TD2-NEXT:   %3 = load i32* %1, align 4
+; TD2-NEXT:   %4 = add i32 %2, %3
+; TD2-NEXT:   ret i32 %4
+; TD2-NEXT: }
+
+; PF2:       <FUNCTION_BLOCK>
+; PF2-NEXT:    <DECLAREBLOCKS op0=1/>
+; PF2-NEXT:    <INST_LOAD op0=2 op1=3 op2=0/>
+; PF2-NEXT:    <INST_LOAD op0=3 op1=3 op2=0/>
+; PF2-NEXT:    <INST_BINOP op0=2 op1=1 op2=0/>
+; PF2-NEXT:    <INST_RET op0=1/>
+; PF2:       </FUNCTION_BLOCK>
+
+; ------------------------------------------------------
+
+; Test how we handle bitcasts if optimized in the input file.  This
+; case tests accross blocks.
+define i32 @TwoLoadOptTwoBlocks(i32 %i) {
+  %1 = bitcast [4 x i8]* @bytes to i32*       
+  %2 = load i32* %1, align 4
+  %3 = load i32* %1, align 4
+  %4 = add i32 %2, %3
+  br label %BB
+
+BB:
+  %5 = load i32* %1, align 4
+  %6 = load i32* %1, align 4
+  %7 = add i32 %5, %6
+  ret i32 %4
+}
+
+; TD2:      define i32 @TwoLoadOptTwoBlocks(i32 %i) {
+; TD2-NEXT:   %1 = bitcast [4 x i8]* @bytes to i32*
+; TD2-NEXT:   %2 = load i32* %1, align 4
+; TD2-NEXT:   %3 = load i32* %1, align 4
+; TD2-NEXT:   %4 = add i32 %2, %3
+; TD2-NEXT:   br label %BB
+; TD2:      BB:
+; TD2-NEXT:   %5 = bitcast [4 x i8]* @bytes to i32*
+; TD2-NEXT:   %6 = load i32* %5, align 4
+; TD2-NEXT:   %7 = load i32* %5, align 4
+; TD2-NEXT:   %8 = add i32 %6, %7
+; TD2-NEXT:   ret i32 %4
+; TD2-NEXT: }
+
+; PF2:        <FUNCTION_BLOCK>
+; PF2-NEXT:     <DECLAREBLOCKS op0=2/>
+; PF2-NEXT:     <INST_LOAD op0=2 op1=3 op2=0/>
+; PF2-NEXT:     <INST_LOAD op0=3 op1=3 op2=0/>
+; PF2-NEXT:     <INST_BINOP op0=2 op1=1 op2=0/>
+; PF2-NEXT:     <INST_BR op0=1/>
+; PF2-NEXT:     <INST_LOAD op0=5 op1=3 op2=0/>
+; PF2-NEXT:     <INST_LOAD op0=6 op1=3 op2=0/>
+; PF2-NEXT:     <INST_BINOP op0=2 op1=1 op2=0/>
+; PF2-NEXT:     <INST_RET op0=4/>
+; PF2:        </FUNCTION_BLOCK>
+
+; ------------------------------------------------------
+
+; Test that we elide the simple case of bitcast for a store.
+define void @SimpleStore(i32 %i) {
+  %1 = bitcast [4 x i8]* @bytes to i32*
+  store i32 %i, i32* %1, align 4
+  ret void
+}
+
+; TD2:      define void @SimpleStore(i32 %i) {
+; TD2-NEXT:   %1 = bitcast [4 x i8]* @bytes to i32*
+; TD2-NEXT:   store i32 %i, i32* %1, align 4
+; TD2-NEXT:   ret void
+; TD2-NEXT: }
+
+; PF2:        <FUNCTION_BLOCK>
+; PF2-NEXT:     <DECLAREBLOCKS op0=1/>
+; PF2-NEXT:     <INST_STORE op0=2 op1=1 op2=3/>
+; PF2-NEXT:     <INST_RET/>
+; PF2:        </FUNCTION_BLOCK>