mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-02-10 04:33:40 +00:00
e0e4cc7fd5
Previously, instcombine would only promote an expression tree to the larger type if doing so eliminated two casts. This is because a need to manually do the sign extend after the promoted expression tree with two shifts. Now, we keep track of whether the result of the computation is going to be properly sign extended already. If so, we can unconditionally promote the expression, which allows us to zap more sext's. This implements rdar://6598839 (aka gcc pr38751) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92815 91177308-0d34-0410-b5e6-96231b3b80d8
395 lines
12 KiB
LLVM
395 lines
12 KiB
LLVM
; Tests to make sure elimination of casts is working correctly
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; RUN: opt < %s -instcombine -S | FileCheck %s
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target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128-n8:16:32:64"
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@inbuf = external global [32832 x i8] ; <[32832 x i8]*> [#uses=1]
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define i32 @test1(i32 %A) {
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%c1 = bitcast i32 %A to i32 ; <i32> [#uses=1]
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%c2 = bitcast i32 %c1 to i32 ; <i32> [#uses=1]
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ret i32 %c2
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; CHECK: ret i32 %A
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}
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define i64 @test2(i8 %A) {
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%c1 = zext i8 %A to i16 ; <i16> [#uses=1]
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%c2 = zext i16 %c1 to i32 ; <i32> [#uses=1]
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%Ret = zext i32 %c2 to i64 ; <i64> [#uses=1]
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ret i64 %Ret
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; CHECK: %Ret = zext i8 %A to i64
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; CHECK: ret i64 %Ret
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}
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; This function should just use bitwise AND
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define i64 @test3(i64 %A) {
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%c1 = trunc i64 %A to i8 ; <i8> [#uses=1]
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%c2 = zext i8 %c1 to i64 ; <i64> [#uses=1]
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ret i64 %c2
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; CHECK: %c2 = and i64 %A, 255
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; CHECK: ret i64 %c2
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}
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define i32 @test4(i32 %A, i32 %B) {
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%COND = icmp slt i32 %A, %B ; <i1> [#uses=1]
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; Booleans are unsigned integrals
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%c = zext i1 %COND to i8 ; <i8> [#uses=1]
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; for the cast elim purpose
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%result = zext i8 %c to i32 ; <i32> [#uses=1]
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ret i32 %result
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; CHECK: %COND = icmp slt i32 %A, %B
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; CHECK: %result = zext i1 %COND to i32
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; CHECK: ret i32 %result
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}
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define i32 @test5(i1 %B) {
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; This cast should get folded into
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%c = zext i1 %B to i8 ; <i8> [#uses=1]
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; this cast
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%result = zext i8 %c to i32 ; <i32> [#uses=1]
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ret i32 %result
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; CHECK: %result = zext i1 %B to i32
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; CHECK: ret i32 %result
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}
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define i32 @test6(i64 %A) {
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%c1 = trunc i64 %A to i32 ; <i32> [#uses=1]
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%res = bitcast i32 %c1 to i32 ; <i32> [#uses=1]
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ret i32 %res
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; CHECK: trunc i64 %A to i32
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; CHECK-NEXT: ret i32
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}
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define i64 @test7(i1 %A) {
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%c1 = zext i1 %A to i32 ; <i32> [#uses=1]
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%res = sext i32 %c1 to i64 ; <i64> [#uses=1]
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ret i64 %res
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; CHECK: %res = zext i1 %A to i64
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; CHECK: ret i64 %res
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}
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define i64 @test8(i8 %A) {
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%c1 = sext i8 %A to i64 ; <i64> [#uses=1]
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%res = bitcast i64 %c1 to i64 ; <i64> [#uses=1]
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ret i64 %res
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; CHECK: = sext i8 %A to i64
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; CHECK-NEXT: ret i64
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}
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define i16 @test9(i16 %A) {
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%c1 = sext i16 %A to i32 ; <i32> [#uses=1]
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%c2 = trunc i32 %c1 to i16 ; <i16> [#uses=1]
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ret i16 %c2
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; CHECK: ret i16 %A
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}
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define i16 @test10(i16 %A) {
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%c1 = sext i16 %A to i32 ; <i32> [#uses=1]
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%c2 = trunc i32 %c1 to i16 ; <i16> [#uses=1]
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ret i16 %c2
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; CHECK: ret i16 %A
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}
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declare void @varargs(i32, ...)
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define void @test11(i32* %P) {
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%c = bitcast i32* %P to i16* ; <i16*> [#uses=1]
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call void (i32, ...)* @varargs( i32 5, i16* %c )
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ret void
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; CHECK: call void (i32, ...)* @varargs(i32 5, i32* %P)
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; CHECK: ret void
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}
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define i32* @test12() {
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%p = malloc [4 x i8] ; <[4 x i8]*> [#uses=1]
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%c = bitcast [4 x i8]* %p to i32* ; <i32*> [#uses=1]
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ret i32* %c
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; CHECK: %malloccall = tail call i8* @malloc(i32 4)
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; CHECK: ret i32* %c
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}
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define i8* @test13(i64 %A) {
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%c = getelementptr [0 x i8]* bitcast ([32832 x i8]* @inbuf to [0 x i8]*), i64 0, i64 %A ; <i8*> [#uses=1]
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ret i8* %c
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; CHECK: %c = getelementptr [32832 x i8]* @inbuf, i64 0, i64 %A
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; CHECK: ret i8* %c
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}
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define i1 @test14(i8 %A) {
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%c = bitcast i8 %A to i8 ; <i8> [#uses=1]
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%X = icmp ult i8 %c, -128 ; <i1> [#uses=1]
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ret i1 %X
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; CHECK: %X = icmp sgt i8 %A, -1
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; CHECK: ret i1 %X
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}
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; This just won't occur when there's no difference between ubyte and sbyte
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;bool %test15(ubyte %A) {
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; %c = cast ubyte %A to sbyte
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; %X = setlt sbyte %c, 0 ; setgt %A, 127
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; ret bool %X
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;}
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define i1 @test16(i32* %P) {
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%c = icmp ne i32* %P, null ; <i1> [#uses=1]
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ret i1 %c
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; CHECK: %c = icmp ne i32* %P, null
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; CHECK: ret i1 %c
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}
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define i16 @test17(i1 %tmp3) {
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%c = zext i1 %tmp3 to i32 ; <i32> [#uses=1]
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%t86 = trunc i32 %c to i16 ; <i16> [#uses=1]
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ret i16 %t86
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; CHECK: %t86 = zext i1 %tmp3 to i16
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; CHECK: ret i16 %t86
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}
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define i16 @test18(i8 %tmp3) {
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%c = sext i8 %tmp3 to i32 ; <i32> [#uses=1]
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%t86 = trunc i32 %c to i16 ; <i16> [#uses=1]
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ret i16 %t86
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; CHECK: %t86 = sext i8 %tmp3 to i16
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; CHECK: ret i16 %t86
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}
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define i1 @test19(i32 %X) {
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%c = sext i32 %X to i64 ; <i64> [#uses=1]
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%Z = icmp slt i64 %c, 12345 ; <i1> [#uses=1]
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ret i1 %Z
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; CHECK: %Z = icmp slt i32 %X, 12345
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; CHECK: ret i1 %Z
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}
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define i1 @test20(i1 %B) {
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%c = zext i1 %B to i32 ; <i32> [#uses=1]
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%D = icmp slt i32 %c, -1 ; <i1> [#uses=1]
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;; false
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ret i1 %D
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; CHECK: ret i1 false
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}
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define i32 @test21(i32 %X) {
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%c1 = trunc i32 %X to i8 ; <i8> [#uses=1]
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;; sext -> zext -> and -> nop
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%c2 = sext i8 %c1 to i32 ; <i32> [#uses=1]
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%RV = and i32 %c2, 255 ; <i32> [#uses=1]
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ret i32 %RV
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; CHECK: %c21 = and i32 %X, 255
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; CHECK: ret i32 %c21
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}
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define i32 @test22(i32 %X) {
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%c1 = trunc i32 %X to i8 ; <i8> [#uses=1]
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;; sext -> zext -> and -> nop
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%c2 = sext i8 %c1 to i32 ; <i32> [#uses=1]
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%RV = shl i32 %c2, 24 ; <i32> [#uses=1]
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ret i32 %RV
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; CHECK: %RV = shl i32 %X, 24
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; CHECK: ret i32 %RV
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}
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define i32 @test23(i32 %X) {
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;; Turn into an AND even though X
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%c1 = trunc i32 %X to i16 ; <i16> [#uses=1]
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;; and Z are signed.
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%c2 = zext i16 %c1 to i32 ; <i32> [#uses=1]
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ret i32 %c2
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; CHECK: %c2 = and i32 %X, 65535
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; CHECK: ret i32 %c2
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}
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define i1 @test24(i1 %C) {
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%X = select i1 %C, i32 14, i32 1234 ; <i32> [#uses=1]
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;; Fold cast into select
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%c = icmp ne i32 %X, 0 ; <i1> [#uses=1]
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ret i1 %c
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; CHECK: ret i1 true
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}
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define void @test25(i32** %P) {
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%c = bitcast i32** %P to float** ; <float**> [#uses=1]
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;; Fold cast into null
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store float* null, float** %c
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ret void
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; CHECK: store i32* null, i32** %P
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; CHECK: ret void
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}
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define i32 @test26(float %F) {
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;; no need to cast from float->double.
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%c = fpext float %F to double ; <double> [#uses=1]
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%D = fptosi double %c to i32 ; <i32> [#uses=1]
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ret i32 %D
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; CHECK: %D = fptosi float %F to i32
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; CHECK: ret i32 %D
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}
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define [4 x float]* @test27([9 x [4 x float]]* %A) {
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%c = bitcast [9 x [4 x float]]* %A to [4 x float]* ; <[4 x float]*> [#uses=1]
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ret [4 x float]* %c
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; CHECK: %c = getelementptr inbounds [9 x [4 x float]]* %A, i64 0, i64 0
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; CHECK: ret [4 x float]* %c
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}
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define float* @test28([4 x float]* %A) {
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%c = bitcast [4 x float]* %A to float* ; <float*> [#uses=1]
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ret float* %c
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; CHECK: %c = getelementptr inbounds [4 x float]* %A, i64 0, i64 0
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; CHECK: ret float* %c
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}
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define i32 @test29(i32 %c1, i32 %c2) {
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%tmp1 = trunc i32 %c1 to i8 ; <i8> [#uses=1]
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%tmp4.mask = trunc i32 %c2 to i8 ; <i8> [#uses=1]
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%tmp = or i8 %tmp4.mask, %tmp1 ; <i8> [#uses=1]
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%tmp10 = zext i8 %tmp to i32 ; <i32> [#uses=1]
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ret i32 %tmp10
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; CHECK: %tmp2 = or i32 %c2, %c1
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; CHECK: %tmp10 = and i32 %tmp2, 255
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; CHECK: ret i32 %tmp10
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}
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define i32 @test30(i32 %c1) {
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%c2 = trunc i32 %c1 to i8 ; <i8> [#uses=1]
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%c3 = xor i8 %c2, 1 ; <i8> [#uses=1]
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%c4 = zext i8 %c3 to i32 ; <i32> [#uses=1]
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ret i32 %c4
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; CHECK: %c3 = and i32 %c1, 255
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; CHECK: %c4 = xor i32 %c3, 1
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; CHECK: ret i32 %c4
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}
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define i1 @test31(i64 %A) {
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%B = trunc i64 %A to i32 ; <i32> [#uses=1]
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%C = and i32 %B, 42 ; <i32> [#uses=1]
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%D = icmp eq i32 %C, 10 ; <i1> [#uses=1]
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ret i1 %D
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; CHECK: %C1 = and i64 %A, 42
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; CHECK: %D = icmp eq i64 %C1, 10
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; CHECK: ret i1 %D
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}
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define void @test32(double** %tmp) {
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%tmp8 = malloc [16 x i8] ; <[16 x i8]*> [#uses=1]
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%tmp8.upgrd.1 = bitcast [16 x i8]* %tmp8 to double* ; <double*> [#uses=1]
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store double* %tmp8.upgrd.1, double** %tmp
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ret void
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; CHECK: %malloccall = tail call i8* @malloc(i32 16)
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; CHECK: %tmp8.upgrd.1 = bitcast i8* %malloccall to double*
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; CHECK: store double* %tmp8.upgrd.1, double** %tmp
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; CHECK: ret void
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}
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define i32 @test33(i32 %c1) {
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%x = bitcast i32 %c1 to float ; <float> [#uses=1]
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%y = bitcast float %x to i32 ; <i32> [#uses=1]
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ret i32 %y
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; CHECK: ret i32 %c1
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}
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define i16 @test34(i16 %a) {
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%c1 = zext i16 %a to i32 ; <i32> [#uses=1]
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%tmp21 = lshr i32 %c1, 8 ; <i32> [#uses=1]
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%c2 = trunc i32 %tmp21 to i16 ; <i16> [#uses=1]
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ret i16 %c2
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; CHECK: %tmp21 = lshr i16 %a, 8
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; CHECK: ret i16 %tmp21
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}
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define i16 @test35(i16 %a) {
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%c1 = bitcast i16 %a to i16 ; <i16> [#uses=1]
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%tmp2 = lshr i16 %c1, 8 ; <i16> [#uses=1]
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%c2 = bitcast i16 %tmp2 to i16 ; <i16> [#uses=1]
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ret i16 %c2
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; CHECK: %tmp2 = lshr i16 %a, 8
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; CHECK: ret i16 %tmp2
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}
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; icmp sgt i32 %a, -1
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; rdar://6480391
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define i1 @test36(i32 %a) {
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%b = lshr i32 %a, 31
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%c = trunc i32 %b to i8
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%d = icmp eq i8 %c, 0
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ret i1 %d
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; CHECK: %d = icmp sgt i32 %a, -1
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; CHECK: ret i1 %d
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}
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; ret i1 false
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define i1 @test37(i32 %a) {
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%b = lshr i32 %a, 31
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%c = or i32 %b, 512
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%d = trunc i32 %c to i8
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%e = icmp eq i8 %d, 11
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ret i1 %e
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; CHECK: ret i1 false
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}
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define i64 @test38(i32 %a) {
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%1 = icmp eq i32 %a, -2
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%2 = zext i1 %1 to i8
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%3 = xor i8 %2, 1
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%4 = zext i8 %3 to i64
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ret i64 %4
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; CHECK: %1 = icmp ne i32 %a, -2
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; CHECK: %2 = zext i1 %1 to i64
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; CHECK: ret i64 %2
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}
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define i16 @test39(i16 %a) {
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%tmp = zext i16 %a to i32
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%tmp21 = lshr i32 %tmp, 8
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%tmp5 = shl i32 %tmp, 8
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%tmp.upgrd.32 = or i32 %tmp21, %tmp5
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%tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16
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ret i16 %tmp.upgrd.3
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; CHECK: @test39
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; CHECK: %tmp.upgrd.32 = call i16 @llvm.bswap.i16(i16 %a)
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; CHECK: ret i16 %tmp.upgrd.32
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}
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define i16 @test40(i16 %a) {
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%tmp = zext i16 %a to i32
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%tmp21 = lshr i32 %tmp, 9
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%tmp5 = shl i32 %tmp, 8
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%tmp.upgrd.32 = or i32 %tmp21, %tmp5
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%tmp.upgrd.3 = trunc i32 %tmp.upgrd.32 to i16
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ret i16 %tmp.upgrd.3
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; CHECK: @test40
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; CHECK: %tmp21 = lshr i16 %a, 9
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; CHECK: %tmp5 = shl i16 %a, 8
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; CHECK: %tmp.upgrd.32 = or i16 %tmp21, %tmp5
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; CHECK: ret i16 %tmp.upgrd.32
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}
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; PR1263
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define i32* @test41(i32* %tmp1) {
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%tmp64 = bitcast i32* %tmp1 to { i32 }*
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%tmp65 = getelementptr { i32 }* %tmp64, i32 0, i32 0
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ret i32* %tmp65
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; CHECK: @test41
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; CHECK: ret i32* %tmp1
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}
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define i32 @test42(i32 %X) {
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%Y = trunc i32 %X to i8 ; <i8> [#uses=1]
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%Z = zext i8 %Y to i32 ; <i32> [#uses=1]
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ret i32 %Z
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; CHECK: @test42
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; CHECK: %Z = and i32 %X, 255
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}
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; rdar://6598839
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define zeroext i64 @test43(i8 zeroext %on_off) nounwind readonly {
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%A = zext i8 %on_off to i32
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%B = add i32 %A, -1
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%C = sext i32 %B to i64
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ret i64 %C ;; Should be (add (zext i8 -> i64), -1)
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; CHECK: @test43
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; CHECK-NEXT: %A = zext i8 %on_off to i64
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; CHECK-NEXT: %B = add i64 %A, -1
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; CHECK-NEXT: ret i64 %B
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}
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