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https://github.com/RPCS3/llvm-mirror.git
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a99cdef4f6
Summary: This allows to convert any SExt to a ZExt when we know none of the extended bits are used, specially in cases where there are multiple uses of the value. Reviewers: dmgreen, eli.friedman, spatel, lebedev.ri, nikic Reviewed By: lebedev.ri, nikic Subscribers: hiraditya, dmgreen, craig.topper, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D60413
112 lines
3.3 KiB
LLVM
112 lines
3.3 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -bdce < %s | FileCheck %s
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define i32 @ZEXT_0(i16 %a) {
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; CHECK-LABEL: @ZEXT_0(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[EXT1:%.*]] = zext i16 [[A:%.*]] to i32
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[EXT1]], 65280
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; CHECK-NEXT: [[LSR:%.*]] = lshr i32 [[EXT1]], 8
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; CHECK-NEXT: [[AND2:%.*]] = and i32 [[LSR]], 255
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[AND2]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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entry:
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%ext = sext i16 %a to i32
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%and = and i32 %ext, 65280
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%lsr = lshr i32 %ext, 8
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%and2 = and i32 %lsr, 255
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%or = or i32 %and, %and2
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ret i32 %or
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}
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define i32 @ZEXT_1(i16 %a) {
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; CHECK-LABEL: @ZEXT_1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[EXT1:%.*]] = zext i16 [[A:%.*]] to i32
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; CHECK-NEXT: [[LSR:%.*]] = lshr i32 [[EXT1]], 8
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; CHECK-NEXT: [[AND2:%.*]] = and i32 [[LSR]], 255
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; CHECK-NEXT: [[AND:%.*]] = or i32 [[EXT1]], -65536
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[AND2]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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entry:
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%ext = sext i16 %a to i32
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%lsr = lshr i32 %ext, 8
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%and2 = and i32 %lsr, 255
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%and = or i32 %ext, 4294901760
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%or = or i32 %and, %and2
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ret i32 %or
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}
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define i16 @NOT_ZEXT_0(i16 %a) {
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; CHECK-LABEL: @NOT_ZEXT_0(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[EXT:%.*]] = sext i16 [[A:%.*]] to i32
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[EXT]], 65280
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; CHECK-NEXT: [[LSR:%.*]] = lshr i32 [[EXT]], 9
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; CHECK-NEXT: [[AND2:%.*]] = and i32 [[LSR]], 255
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[AND2]]
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; CHECK-NEXT: [[RET:%.*]] = trunc i32 [[OR]] to i16
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; CHECK-NEXT: ret i16 [[RET]]
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;
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entry:
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%ext = sext i16 %a to i32
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%and = and i32 %ext, 65280
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%lsr = lshr i32 %ext, 9
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%and2 = and i32 %lsr, 255
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%or = or i32 %and, %and2
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%ret = trunc i32 %or to i16
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ret i16 %ret
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}
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define i32 @NOT_ZEXT_1(i16 %a) {
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; CHECK-LABEL: @NOT_ZEXT_1(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[EXT:%.*]] = sext i16 [[A:%.*]] to i32
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; CHECK-NEXT: [[AND:%.*]] = and i32 [[EXT]], 85280
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; CHECK-NEXT: [[LSR:%.*]] = lshr i32 [[EXT]], 8
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; CHECK-NEXT: [[AND2:%.*]] = and i32 [[LSR]], 255
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[AND2]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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entry:
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%ext = sext i16 %a to i32
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%and = and i32 %ext, 85280
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%lsr = lshr i32 %ext, 8
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%and2 = and i32 %lsr, 255
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%or = or i32 %and, %and2
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ret i32 %or
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}
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define i32 @NOT_ZEXT_2(i16 %a) {
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; CHECK-LABEL: @NOT_ZEXT_2(
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; CHECK-NEXT: entry:
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; CHECK-NEXT: [[EXT:%.*]] = sext i16 [[A:%.*]] to i32
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; CHECK-NEXT: [[LSR:%.*]] = lshr i32 [[EXT]], 8
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; CHECK-NEXT: [[AND2:%.*]] = and i32 [[LSR]], 255
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; CHECK-NEXT: [[AND:%.*]] = xor i32 [[EXT]], -65536
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; CHECK-NEXT: [[OR:%.*]] = or i32 [[AND]], [[AND2]]
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; CHECK-NEXT: ret i32 [[OR]]
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;
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entry:
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%ext = sext i16 %a to i32
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%lsr = lshr i32 %ext, 8
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%and2 = and i32 %lsr, 255
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%and = xor i32 %ext, 4294901760
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%or = or i32 %and, %and2
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ret i32 %or
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}
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define i16 @clear_assumptions(i8 %x, i16 %y) {
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; CHECK-LABEL: @clear_assumptions(
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; CHECK-NEXT: [[EXT1:%.*]] = zext i8 [[X:%.*]] to i16
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; CHECK-NEXT: [[ADD:%.*]] = add i16 [[EXT1]], [[Y:%.*]]
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; CHECK-NEXT: [[AND:%.*]] = and i16 [[ADD]], 255
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; CHECK-NEXT: ret i16 [[AND]]
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;
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%ext = sext i8 %x to i16
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%add = add nsw i16 %ext, %y
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%and = and i16 %add, 255
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ret i16 %and
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}
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