derek.holloway
7502bf64a4
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58 lines
1.3 KiB
LLVM
58 lines
1.3 KiB
LLVM
; RUN: opt -S -passes=instcombine < %s | FileCheck %s
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; rdar://12182093
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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-S128"
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target triple = "x86_64-apple-macosx10.8.0"
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; CHECK-LABEL: @udiv400(
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; CHECK: udiv i32 %x, 400
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; CHECK: ret
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define i32 @udiv400(i32 %x) {
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entry:
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%div = lshr i32 %x, 2
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%div1 = udiv i32 %div, 100
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ret i32 %div1
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}
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; CHECK-LABEL: @udiv400_no(
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; CHECK: ashr
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; CHECK: div
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; CHECK: ret
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define i32 @udiv400_no(i32 %x) {
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entry:
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%div = ashr i32 %x, 2
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%div1 = udiv i32 %div, 100
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ret i32 %div1
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}
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; CHECK-LABEL: @sdiv400_yes(
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; CHECK: udiv i32 %x, 400
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; CHECK: ret
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define i32 @sdiv400_yes(i32 %x) {
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entry:
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%div = lshr i32 %x, 2
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; The sign bits of both operands are zero (i.e. we can prove they are
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; unsigned inputs), turn this into a udiv.
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; Next, optimize this just like sdiv.
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%div1 = sdiv i32 %div, 100
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ret i32 %div1
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}
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; CHECK-LABEL: @udiv_i80(
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; CHECK: udiv i80 %x, 400
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; CHECK: ret
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define i80 @udiv_i80(i80 %x) {
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%div = lshr i80 %x, 2
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%div1 = udiv i80 %div, 100
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ret i80 %div1
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}
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define i32 @no_crash_notconst_udiv(i32 %x, i32 %notconst) {
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%div = lshr i32 %x, %notconst
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%div1 = udiv i32 %div, 100
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ret i32 %div1
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}
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