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