5fdab3c81b
Like what has been done in AArch64 (D125335). We enable this under `-O2` to show the codegen diffs here but we may only do this under `-O3` like AArch64. There are two cases that we may produce these eliminable copies: 1. ISel of `FrameIndex`. Like `rvv/fixed-vectors-calling-conv.ll`. 2. Tail duplication. Like `select-optimize-multiple.ll`. Reviewed By: craig.topper Differential Revision: https://reviews.llvm.org/D144535
65 lines
1.8 KiB
LLVM
65 lines
1.8 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -O3 -mtriple=riscv64 -riscv-enable-copy-propagation=false | FileCheck %s --check-prefix=NOPROP
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; RUN: llc < %s -O3 -mtriple=riscv64 -riscv-enable-copy-propagation=true | FileCheck %s --check-prefix=PROP
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define void @copyprop_after_mbp(i32 %v, i32* %a, i32* %b, i32* %c, i32* %d) {
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; NOPROP-LABEL: copyprop_after_mbp:
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; NOPROP: # %bb.0:
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; NOPROP-NEXT: sext.w a0, a0
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; NOPROP-NEXT: li a5, 10
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; NOPROP-NEXT: bne a0, a5, .LBB0_2
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; NOPROP-NEXT: # %bb.1: # %bb.0
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; NOPROP-NEXT: li a0, 15
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; NOPROP-NEXT: sw a0, 0(a2)
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; NOPROP-NEXT: li a0, 1
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; NOPROP-NEXT: sw a0, 0(a1)
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; NOPROP-NEXT: li a0, 12
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; NOPROP-NEXT: sw a0, 0(a4)
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; NOPROP-NEXT: ret
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; NOPROP-NEXT: .LBB0_2: # %bb.1
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; NOPROP-NEXT: li a0, 0
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; NOPROP-NEXT: li a2, 25
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; NOPROP-NEXT: sw a2, 0(a3)
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; NOPROP-NEXT: sw a0, 0(a1)
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; NOPROP-NEXT: li a0, 12
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; NOPROP-NEXT: sw a0, 0(a4)
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; NOPROP-NEXT: ret
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;
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; PROP-LABEL: copyprop_after_mbp:
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; PROP: # %bb.0:
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; PROP-NEXT: sext.w a0, a0
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; PROP-NEXT: li a5, 10
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; PROP-NEXT: bne a0, a5, .LBB0_2
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; PROP-NEXT: # %bb.1: # %bb.0
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; PROP-NEXT: li a0, 15
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; PROP-NEXT: sw a0, 0(a2)
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; PROP-NEXT: li a0, 1
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; PROP-NEXT: sw a0, 0(a1)
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; PROP-NEXT: li a0, 12
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; PROP-NEXT: sw a0, 0(a4)
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; PROP-NEXT: ret
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; PROP-NEXT: .LBB0_2: # %bb.1
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; PROP-NEXT: li a2, 25
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; PROP-NEXT: sw a2, 0(a3)
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; PROP-NEXT: sw zero, 0(a1)
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; PROP-NEXT: li a0, 12
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; PROP-NEXT: sw a0, 0(a4)
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; PROP-NEXT: ret
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%1 = icmp eq i32 %v, 10
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br i1 %1, label %bb.0, label %bb.1
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bb.0:
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store i32 15, i32* %b, align 4
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br label %bb.2
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bb.1:
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store i32 25, i32* %c, align 4
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br label %bb.2
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bb.2:
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%2 = phi i32 [ 1, %bb.0 ], [ 0, %bb.1 ]
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store i32 %2, i32* %a, align 4
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store i32 12, i32* %d, align 4
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ret void
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}
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