6d6287af84
This fold already exist but there is a call to [shouldChangeType
](91fdfec263/llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp (L1202))
that blocks it if the target layout is missing a definition of the types
in the casts.
closes https://github.com/llvm/llvm-project/issues/61650
31 lines
900 B
LLVM
31 lines
900 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
|
|
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
|
|
|
|
target datalayout = "n8:16:32:64"
|
|
|
|
define i32 @trunc_shl_zext_32(i32 %a) {
|
|
; CHECK-LABEL: define i32 @trunc_shl_zext_32
|
|
; CHECK-SAME: (i32 [[A:%.*]]) {
|
|
; CHECK-NEXT: [[SHL:%.*]] = shl i32 [[A]], 4
|
|
; CHECK-NEXT: [[EXT:%.*]] = and i32 [[SHL]], 65520
|
|
; CHECK-NEXT: ret i32 [[EXT]]
|
|
;
|
|
%trunc = trunc i32 %a to i16
|
|
%shl = shl i16 %trunc, 4
|
|
%ext = zext i16 %shl to i32
|
|
ret i32 %ext
|
|
}
|
|
|
|
define i64 @trunc_shl_zext_64(i64 %a) {
|
|
; CHECK-LABEL: define i64 @trunc_shl_zext_64
|
|
; CHECK-SAME: (i64 [[A:%.*]]) {
|
|
; CHECK-NEXT: [[SHL:%.*]] = shl i64 [[A]], 7
|
|
; CHECK-NEXT: [[EXT:%.*]] = and i64 [[SHL]], 128
|
|
; CHECK-NEXT: ret i64 [[EXT]]
|
|
;
|
|
%trunc = trunc i64 %a to i8
|
|
%shl = shl i8 %trunc, 7
|
|
%ext = zext i8 %shl to i64
|
|
ret i64 %ext
|
|
}
|