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51fa2dddea
First half of PR40800, this patch adds DAG undef handling to icmp instructions to match the behaviour in llvm::ConstantFoldCompareInstruction and SimplifyICmpInst, this permits constant folding of vector comparisons where some elements had been reduced to UNDEF (by SimplifyDemandedVectorElts etc.). This involved a lot of tweaking to reduced tests as bugpoint loves to reduce icmp arguments to undef........ Differential Revision: https://reviews.llvm.org/D59363 llvm-svn: 356938
40 lines
976 B
LLVM
40 lines
976 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
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; RUN: llc < %s -verify-machineinstrs | FileCheck %s
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target datalayout = "E-m:e-i64:64-n32:64-S128"
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target triple = "sparc64-unknown-linux-gnu"
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define void @f(i64 %a0) align 2 {
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; CHECK-LABEL: f:
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; CHECK: .cfi_startproc
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; CHECK-NEXT: ! %bb.0: ! %entry
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; CHECK-NEXT: cmp %o0, 0
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; CHECK-NEXT: be %xcc, .LBB0_2
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; CHECK-NEXT: nop
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; CHECK-NEXT: ba .LBB0_1
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; CHECK-NEXT: nop
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; CHECK-NEXT: .LBB0_2: ! %targetblock
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; CHECK-NEXT: mov %g0, %o0
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; CHECK-NEXT: cmp %o0, 0
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; CHECK-NEXT: bne .LBB0_4
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; CHECK-NEXT: nop
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; CHECK-NEXT: ! %bb.3: ! %cond.false.i83
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; CHECK-NEXT: .LBB0_1: ! %cond.false
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; CHECK-NEXT: .LBB0_4: ! %exit.i85
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entry:
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%cmp = icmp eq i64 %a0, 0
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br i1 %cmp, label %targetblock, label %cond.false
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cond.false:
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unreachable
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targetblock:
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br i1 undef, label %cond.false.i83, label %exit.i85
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cond.false.i83:
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unreachable
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exit.i85:
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unreachable
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}
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