84 lines
2.3 KiB
LLVM
84 lines
2.3 KiB
LLVM
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; RUN: llc -march=x86-64 < %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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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* 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* 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, i32* 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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; DAGCombiner shouldn't fold the sdiv (ashr) away.
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; rdar://8636812
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; CHECK: test2:
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; CHECK: sarl
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define i32 @test2() nounwind {
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entry:
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%i = alloca i32, align 4
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%j = alloca i8, align 1
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store i32 127, i32* %i, align 4
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store i8 0, i8* %j, align 1
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%tmp3 = load i32* %i, align 4
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%mul = mul nsw i32 %tmp3, 2
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%conv4 = trunc i32 %mul to i8
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%conv5 = sext i8 %conv4 to i32
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%div6 = sdiv i32 %conv5, 2
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%conv7 = trunc i32 %div6 to i8
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%conv9 = sext i8 %conv7 to i32
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%cmp = icmp eq i32 %conv9, -1
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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ret i32 0
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if.end: ; preds = %entry
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call void @abort() noreturn
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unreachable
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}
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declare void @abort() noreturn
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declare void @exit(i32) noreturn
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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(i32 *%P) nounwind ssp {
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store volatile i32 128, i32* %P
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%tmp4.pre = load i32* %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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; CHECK: 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: ret
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}
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