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https://github.com/RPCS3/llvm-mirror.git
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e69a354b33
Summary: If the operands of a udiv/urem can be proved to fit within a smaller power-of-two-sized type, reduce the width of the udiv/urem. Backed out for causing performance regressions. Re-landing because we've determined that these regressions were noise. Original Differential Revision: https://reviews.llvm.org/D44102 llvm-svn: 328096
102 lines
1.6 KiB
LLVM
102 lines
1.6 KiB
LLVM
; RUN: opt < %s -correlated-propagation -S | FileCheck %s
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; CHECK-LABEL: @test_nop
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define void @test_nop(i32 %n) {
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; CHECK udiv i32 %n, 100
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%div = udiv i32 %n, 100
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ret void
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}
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; CHECK-LABEL: @test1(
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define void @test1(i32 %n) {
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entry:
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%cmp = icmp ule i32 %n, 65535
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: urem i16
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%div = urem i32 %n, 100
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @test2(
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define void @test2(i32 %n) {
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entry:
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%cmp = icmp ule i32 %n, 65536
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: urem i32 %n, 100
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%div = urem i32 %n, 100
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @test3(
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define void @test3(i32 %m, i32 %n) {
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entry:
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%cmp1 = icmp ult i32 %m, 65535
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%cmp2 = icmp ult i32 %n, 65535
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%cmp = and i1 %cmp1, %cmp2
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: urem i16
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%div = urem i32 %m, %n
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @test4(
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define void @test4(i32 %m, i32 %n) {
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entry:
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%cmp1 = icmp ult i32 %m, 65535
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%cmp2 = icmp ule i32 %n, 65536
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%cmp = and i1 %cmp1, %cmp2
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: urem i32 %m, %n
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%div = urem i32 %m, %n
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @test5
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define void @test5(i32 %n) {
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%trunc = and i32 %n, 63
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; CHECK: urem i8
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%div = urem i32 %trunc, 42
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ret void
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}
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; CHECK-LABEL: @test6
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define void @test6(i32 %n) {
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entry:
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%cmp = icmp ule i32 %n, 255
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br i1 %cmp, label %bb, label %exit
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bb:
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; CHECK: urem i8
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%div = srem i32 %n, 100
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @non_power_of_2
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define void @non_power_of_2(i24 %n) {
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%div = urem i24 %n, 42
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ret void
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}
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