forked from OSchip/llvm-project
96 lines
3.2 KiB
LLVM
96 lines
3.2 KiB
LLVM
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt -S -instcombine < %s | FileCheck %s
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define i16 @foo(i16 %x) {
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; CHECK-LABEL: @foo(
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; CHECK-NEXT: [[T1:%.*]] = and i16 [[X:%.*]], 255
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; CHECK-NEXT: ret i16 [[T1]]
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;
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%t1 = and i16 %x, 255
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%t2 = zext i16 %t1 to i32
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%t3 = icmp ult i32 %t2, 255
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%t4 = select i1 %t3, i32 %t2, i32 255
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%t5 = trunc i32 %t4 to i16
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%t6 = and i16 %t5, 255
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ret i16 %t6
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}
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; This contains a min/max pair to clamp a value to 12 bits.
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; By analyzing the clamp pattern, we can tell the add doesn't have signed overflow.
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define i16 @min_max_clamp(i16 %x) {
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; CHECK-LABEL: @min_max_clamp(
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; CHECK-NEXT: [[A:%.*]] = icmp sgt i16 [[X:%.*]], -2048
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; CHECK-NEXT: [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 -2048
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; CHECK-NEXT: [[C:%.*]] = icmp slt i16 [[B]], 2047
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; CHECK-NEXT: [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 2047
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; CHECK-NEXT: [[E:%.*]] = add nsw i16 [[D]], 1
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; CHECK-NEXT: ret i16 [[E]]
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;
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%a = icmp sgt i16 %x, -2048
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%b = select i1 %a, i16 %x, i16 -2048
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%c = icmp slt i16 %b, 2047
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%d = select i1 %c, i16 %b, i16 2047
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%e = add i16 %d, 1
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ret i16 %e
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}
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; Same as above with min/max reversed.
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define i16 @min_max_clamp_2(i16 %x) {
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; CHECK-LABEL: @min_max_clamp_2(
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; CHECK-NEXT: [[A:%.*]] = icmp slt i16 [[X:%.*]], 2047
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; CHECK-NEXT: [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 2047
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; CHECK-NEXT: [[C:%.*]] = icmp sgt i16 [[B]], -2048
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; CHECK-NEXT: [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 -2048
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; CHECK-NEXT: [[E:%.*]] = add nsw i16 [[D]], 1
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; CHECK-NEXT: ret i16 [[E]]
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;
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%a = icmp slt i16 %x, 2047
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%b = select i1 %a, i16 %x, i16 2047
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%c = icmp sgt i16 %b, -2048
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%d = select i1 %c, i16 %b, i16 -2048
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%e = add i16 %d, 1
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ret i16 %e
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}
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; This contains a min/max pair to clamp a value to 12 bits.
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; By analyzing the clamp pattern, we can tell that the second add doesn't
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; overflow the original type and can be moved before the extend.
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define i32 @min_max_clamp_3(i16 %x) {
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; CHECK-LABEL: @min_max_clamp_3(
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; CHECK-NEXT: [[A:%.*]] = icmp sgt i16 [[X:%.*]], -2048
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; CHECK-NEXT: [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 -2048
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; CHECK-NEXT: [[C:%.*]] = icmp slt i16 [[B]], 2047
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; CHECK-NEXT: [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 2047
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; CHECK-NEXT: [[G:%.*]] = sext i16 [[D]] to i32
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; CHECK-NEXT: ret i32 [[G]]
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;
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%a = icmp sgt i16 %x, -2048
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%b = select i1 %a, i16 %x, i16 -2048
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%c = icmp slt i16 %b, 2047
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%d = select i1 %c, i16 %b, i16 2047
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%e = add i16 %d, 1
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%f = sext i16 %e to i32
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%g = add i32 %f, -1
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ret i32 %g
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}
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; Same as above with min/max order reversed
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define i32 @min_max_clamp_4(i16 %x) {
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; CHECK-LABEL: @min_max_clamp_4(
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; CHECK-NEXT: [[A:%.*]] = icmp slt i16 [[X:%.*]], 2047
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; CHECK-NEXT: [[B:%.*]] = select i1 [[A]], i16 [[X]], i16 2047
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; CHECK-NEXT: [[C:%.*]] = icmp sgt i16 [[B]], -2048
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; CHECK-NEXT: [[D:%.*]] = select i1 [[C]], i16 [[B]], i16 -2048
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; CHECK-NEXT: [[G:%.*]] = sext i16 [[D]] to i32
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; CHECK-NEXT: ret i32 [[G]]
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;
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%a = icmp slt i16 %x, 2047
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%b = select i1 %a, i16 %x, i16 2047
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%c = icmp sgt i16 %b, -2048
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%d = select i1 %c, i16 %b, i16 -2048
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%e = add i16 %d, 1
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%f = sext i16 %e to i32
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%g = add i32 %f, -1
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ret i32 %g
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}
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