cd83333fc8
This patch folds redundant load immediates into a zero for instructions which recognise this as the value zero and not the register. If the load immediate is no longer in use it is then deleted. This is already done in earlier passes but the ppc-mi-peephole allows for a more general implementation. Differential Revision: https://reviews.llvm.org/D69168
41 lines
1.5 KiB
LLVM
41 lines
1.5 KiB
LLVM
; NOTE: This test verifies that a redundant load immediate of zero is folded
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; NOTE: from its use in an isel and deleted as it is no longer in use.
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; RUN: llc -mcpu=pwr9 -mtriple=powerpc64le-unknown-linux-gnu \
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; RUN: -ppc-asm-full-reg-names -verify-machineinstrs < %s | FileCheck %s
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; RUN: llc -mcpu=pwr9 -mtriple=powerpc64-unknown-linux-gnu \
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; RUN: -ppc-asm-full-reg-names -verify-machineinstrs < %s | FileCheck %s
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%0 = type { i32, i16 }
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@val = common dso_local local_unnamed_addr global %0* null, align 8
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define dso_local signext i32 @redunLoadImm(%0* %arg) {
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; CHECK-LABEL: redunLoadImm:
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; verify that the load immediate has been folded into the isel and deleted
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; CHECK-NOT: li r[[REG1:[0-9]+]], 0
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; CHECK: isel r[[REG2:[0-9]+]], 0, r[[REG3:[0-9]+]], eq
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bb:
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%tmp = icmp eq %0* %arg, null
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br i1 %tmp, label %bb9, label %bb1
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bb1: ; preds = %bb
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%tmp2 = getelementptr inbounds %0, %0* %arg, i64 0, i32 1
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br label %bb3
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bb3: ; preds = %bb3, %bb1
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%tmp4 = load i16, i16* %tmp2, align 4
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%tmp5 = sext i16 %tmp4 to i64
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%tmp6 = getelementptr inbounds %0, %0* %arg, i64 %tmp5
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%tmp7 = icmp eq i16 %tmp4, 0
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%tmp8 = select i1 %tmp7, %0* null, %0* %tmp6
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store %0* %tmp8, %0** @val, align 8
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br label %bb3
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bb9: ; preds = %bb
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%tmp10 = load %0*, %0** @val, align 8
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%tmp11 = getelementptr inbounds %0, %0* %tmp10, i64 0, i32 0
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%tmp12 = load i32, i32* %tmp11, align 4
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ret i32 %tmp12
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}
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