forked from OSchip/llvm-project
167 lines
3.8 KiB
LLVM
167 lines
3.8 KiB
LLVM
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
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"
|
|
|
|
; Instcombine should be able to eliminate all of these ext casts.
|
|
|
|
declare void @use(i32)
|
|
|
|
define i64 @test1(i64 %a) {
|
|
%b = trunc i64 %a to i32
|
|
%c = and i32 %b, 15
|
|
%d = zext i32 %c to i64
|
|
call void @use(i32 %b)
|
|
ret i64 %d
|
|
; CHECK-LABEL: @test1(
|
|
; CHECK-NOT: ext
|
|
; CHECK: ret
|
|
}
|
|
define i64 @test2(i64 %a) {
|
|
%b = trunc i64 %a to i32
|
|
%c = shl i32 %b, 4
|
|
%q = ashr i32 %c, 4
|
|
%d = sext i32 %q to i64
|
|
call void @use(i32 %b)
|
|
ret i64 %d
|
|
; CHECK-LABEL: @test2(
|
|
; CHECK: shl i64 %a, 36
|
|
; CHECK: %d = ashr exact i64 {{.*}}, 36
|
|
; CHECK: ret i64 %d
|
|
}
|
|
define i64 @test3(i64 %a) {
|
|
%b = trunc i64 %a to i32
|
|
%c = and i32 %b, 8
|
|
%d = zext i32 %c to i64
|
|
call void @use(i32 %b)
|
|
ret i64 %d
|
|
; CHECK-LABEL: @test3(
|
|
; CHECK-NOT: ext
|
|
; CHECK: ret
|
|
}
|
|
define i64 @test4(i64 %a) {
|
|
%b = trunc i64 %a to i32
|
|
%c = and i32 %b, 8
|
|
%x = xor i32 %c, 8
|
|
%d = zext i32 %x to i64
|
|
call void @use(i32 %b)
|
|
ret i64 %d
|
|
; CHECK-LABEL: @test4(
|
|
; CHECK: = and i64 %a, 8
|
|
; CHECK: = xor i64 {{.*}}, 8
|
|
; CHECK-NOT: ext
|
|
; CHECK: ret
|
|
}
|
|
|
|
define i32 @test5(i32 %A) {
|
|
%B = zext i32 %A to i128
|
|
%C = lshr i128 %B, 16
|
|
%D = trunc i128 %C to i32
|
|
ret i32 %D
|
|
; CHECK-LABEL: @test5(
|
|
; CHECK: %C = lshr i32 %A, 16
|
|
; CHECK: ret i32 %C
|
|
}
|
|
|
|
define i32 @test6(i64 %A) {
|
|
%B = zext i64 %A to i128
|
|
%C = lshr i128 %B, 32
|
|
%D = trunc i128 %C to i32
|
|
ret i32 %D
|
|
; CHECK-LABEL: @test6(
|
|
; CHECK: %C = lshr i64 %A, 32
|
|
; CHECK: %D = trunc i64 %C to i32
|
|
; CHECK: ret i32 %D
|
|
}
|
|
|
|
define i92 @test7(i64 %A) {
|
|
%B = zext i64 %A to i128
|
|
%C = lshr i128 %B, 32
|
|
%D = trunc i128 %C to i92
|
|
ret i92 %D
|
|
; CHECK-LABEL: @test7(
|
|
; CHECK: %B = zext i64 %A to i92
|
|
; CHECK: %C = lshr i92 %B, 32
|
|
; CHECK: ret i92 %C
|
|
}
|
|
|
|
define i64 @test8(i32 %A, i32 %B) {
|
|
%tmp38 = zext i32 %A to i128
|
|
%tmp32 = zext i32 %B to i128
|
|
%tmp33 = shl i128 %tmp32, 32
|
|
%ins35 = or i128 %tmp33, %tmp38
|
|
%tmp42 = trunc i128 %ins35 to i64
|
|
ret i64 %tmp42
|
|
; CHECK-LABEL: @test8(
|
|
; CHECK: %tmp38 = zext i32 %A to i64
|
|
; CHECK: %tmp32 = zext i32 %B to i64
|
|
; CHECK: %tmp33 = shl nuw i64 %tmp32, 32
|
|
; CHECK: %ins35 = or i64 %tmp33, %tmp38
|
|
; CHECK: ret i64 %ins35
|
|
}
|
|
|
|
define i8 @test9(i32 %X) {
|
|
%Y = and i32 %X, 42
|
|
%Z = trunc i32 %Y to i8
|
|
ret i8 %Z
|
|
; CHECK-LABEL: @test9(
|
|
; CHECK: trunc
|
|
; CHECK: and
|
|
; CHECK: ret
|
|
}
|
|
|
|
; rdar://8808586
|
|
define i8 @test10(i32 %X) {
|
|
%Y = trunc i32 %X to i8
|
|
%Z = and i8 %Y, 42
|
|
ret i8 %Z
|
|
; CHECK-LABEL: @test10(
|
|
; CHECK: trunc
|
|
; CHECK: and
|
|
; CHECK: ret
|
|
}
|
|
|
|
; PR25543
|
|
; https://llvm.org/bugs/show_bug.cgi?id=25543
|
|
; TODO: This could be extractelement.
|
|
|
|
define i32 @trunc_bitcast1(<4 x i32> %v) {
|
|
%bc = bitcast <4 x i32> %v to i128
|
|
%shr = lshr i128 %bc, 32
|
|
%ext = trunc i128 %shr to i32
|
|
ret i32 %ext
|
|
|
|
; CHECK-LABEL: @trunc_bitcast1(
|
|
; CHECK-NEXT: %bc = bitcast <4 x i32> %v to i128
|
|
; CHECK-NEXT: %shr = lshr i128 %bc, 32
|
|
; CHECK-NEXT: %ext = trunc i128 %shr to i32
|
|
; CHECK-NEXT: ret i32 %ext
|
|
}
|
|
|
|
; TODO: This could be bitcast + extractelement.
|
|
|
|
define i32 @trunc_bitcast2(<2 x i64> %v) {
|
|
%bc = bitcast <2 x i64> %v to i128
|
|
%shr = lshr i128 %bc, 64
|
|
%ext = trunc i128 %shr to i32
|
|
ret i32 %ext
|
|
|
|
; CHECK-LABEL: @trunc_bitcast2(
|
|
; CHECK-NEXT: %bc = bitcast <2 x i64> %v to i128
|
|
; CHECK-NEXT: %shr = lshr i128 %bc, 64
|
|
; CHECK-NEXT: %ext = trunc i128 %shr to i32
|
|
; CHECK-NEXT: ret i32 %ext
|
|
}
|
|
|
|
; TODO: The shift is optional. This could be extractelement.
|
|
|
|
define i32 @trunc_bitcast3(<4 x i32> %v) {
|
|
%bc = bitcast <4 x i32> %v to i128
|
|
%ext = trunc i128 %bc to i32
|
|
ret i32 %ext
|
|
|
|
; CHECK-LABEL: @trunc_bitcast3(
|
|
; CHECK-NEXT: %bc = bitcast <4 x i32> %v to i128
|
|
; CHECK-NEXT: %ext = trunc i128 %bc to i32
|
|
; CHECK-NEXT: ret i32 %ext
|
|
}
|
|
|