derek.holloway
7502bf64a4
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58 lines
1.9 KiB
LLVM
58 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
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; RUN: llc < %s | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
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target triple = "x86_64-pc-linux-gnu"
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; DAGCombiner should fold this code in finite time.
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; rdar://8606584
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define void @test1() nounwind readnone {
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; CHECK-LABEL: test1:
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; CHECK: # %bb.0: # %bb.nph
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; CHECK-NEXT: .p2align 4
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; CHECK-NEXT: .LBB0_1: # %while.cond
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; CHECK-NEXT: # =>This Inner Loop Header: Depth=1
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; CHECK-NEXT: jmp .LBB0_1
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bb.nph:
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br label %while.cond
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while.cond: ; preds = %while.cond, %bb.nph
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%tmp6 = load i32, ptr undef, align 4
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%and = or i64 undef, undef
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%conv11 = zext i32 undef to i64
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%conv14 = zext i32 %tmp6 to i64
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%shl15 = shl i64 %conv14, 1
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%shl15.masked = and i64 %shl15, 4294967294
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%and17 = or i64 %shl15.masked, %conv11
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%add = add i64 %and17, 1
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%xor = xor i64 %add, %and
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%tmp20 = load i64, ptr undef, align 8
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%add21 = add i64 %xor, %tmp20
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%conv22 = trunc i64 %add21 to i32
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store i32 %conv22, ptr undef, align 4
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br i1 false, label %while.end, label %while.cond
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while.end: ; preds = %while.cond
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ret void
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}
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; DAG Combiner can't fold this into a load of the 1'th byte.
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; PR8757
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define i32 @test3(ptr%P) nounwind ssp {
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; CHECK-LABEL: test3:
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; CHECK: # %bb.0:
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; CHECK-NEXT: movl $128, (%rdi)
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; CHECK-NEXT: movsbl (%rdi), %eax
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; CHECK-NEXT: movzbl %ah, %eax
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; CHECK-NEXT: retq
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store volatile i32 128, ptr %P
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%tmp4.pre = load i32, ptr %P
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%phitmp = trunc i32 %tmp4.pre to i16
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%phitmp13 = shl i16 %phitmp, 8
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%phitmp14 = ashr i16 %phitmp13, 8
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%phitmp15 = lshr i16 %phitmp14, 8
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%phitmp16 = zext i16 %phitmp15 to i32
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ret i32 %phitmp16
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}
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