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llvm-project/llvm/test/CodeGen/PowerPC/add-fi.ll

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[PowerPC] Better lowering for add/or of a FrameIndex If we have an add (or an or that is really an add), where one operand is a FrameIndex and the other operand is a small constant, we can combine the lowering of the FrameIndex (which is lowered as an add of the FI and a zero offset) with the constant operand. Amusingly, this is an old potential improvement entry from lib/Target/PowerPC/README.txt which had never been resolved. In short, we used to lower: %X = alloca { i32, i32 } %Y = getelementptr {i32,i32}* %X, i32 0, i32 1 ret i32* %Y as: addi 3, 1, -8 ori 3, 3, 4 blr and now we produce: addi 3, 1, -4 blr which is much more sensible. llvm-svn: 224071
2014-12-12 06:51:06 +08:00
; RUN: llc -mcpu=ppc64 < %s | FileCheck %s
target datalayout = "E-m:e-i64:64-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
define i32* @test1() {
%X = alloca { i32, i32 }
%Y = getelementptr {i32,i32}* %X, i32 0, i32 1
ret i32* %Y
; CHECK-LABEL: @test1
; CHECK: addi 3, 1, -4
; CHECK: blr
}
define i32* @test2() {
%X = alloca { i32, i32, i32, i32 }
%Y = getelementptr {i32,i32,i32,i32}* %X, i32 0, i32 3
ret i32* %Y
; CHECK-LABEL: @test2
; CHECK: addi 3, 1, -4
; CHECK: blr
}