forked from OSchip/llvm-project
[mips][FastISel] Allow computation of addresses from constant expressions.
Summary: Try to compute addresses when the offset from a memory location is a constant expression. Based on a patch by Reed Kotler. Test Plan: Passes test-suite for -O0/O2 and mips 32 r1/r2 Reviewers: rkotler, dsanders Subscribers: llvm-commits, aemerson, rfuhler Differential Revision: http://reviews.llvm.org/D6767 llvm-svn: 237117
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@ -390,8 +390,10 @@ bool MipsFastISel::computeAddress(const Value *Obj, Address &Addr) {
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Opcode = I->getOpcode();
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U = I;
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}
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} else if (isa<ConstantExpr>(Obj))
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return false;
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} else if (const ConstantExpr *C = dyn_cast<ConstantExpr>(Obj)) {
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Opcode = C->getOpcode();
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U = C;
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}
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switch (Opcode) {
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default:
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break;
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@ -0,0 +1,18 @@
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; RUN: llc -march=mipsel -mcpu=mips32 -relocation-model=pic \
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; RUN: -fast-isel=true -mips-fast-isel -fast-isel-abort=1 < %s | FileCheck %s
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; RUN: llc -march=mipsel -mcpu=mips32r2 -relocation-model=pic \
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; RUN: -fast-isel=true -mips-fast-isel -fast-isel-abort=1 < %s | FileCheck %s
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@ARR = external global [10 x i32], align 4
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define void @foo() {
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; CHECK-LABEL: foo
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; CHECK-DAG: lw $[[ARR:[0-9]+]], %got(ARR)({{.*}})
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; CHECK-DAG: addiu $[[T0:[0-9]+]], $zero, 12345
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; CHECK: sw $[[T0]], 8($[[ARR]])
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entry:
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store i32 12345, i32* getelementptr inbounds ([10 x i32], [10 x i32]* @ARR, i32 0, i32 2), align 4
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ret void
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}
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