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|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -passes=instcombine -S | FileCheck %s
define i1 @test1(i8 %A) {
; CHECK-LABEL: @test1(
; CHECK-NEXT: ret i1 true
;
%B = sitofp i8 %A to double
%C = fcmp ult double %B, 128.0
ret i1 %C
}
define i1 @test2(i8 %A) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: ret i1 true
;
%B = sitofp i8 %A to double
%C = fcmp ugt double %B, -128.1
ret i1 %C
}
define i1 @test3(i8 %A) {
; CHECK-LABEL: @test3(
; CHECK-NEXT: ret i1 true
;
%B = sitofp i8 %A to double
%C = fcmp ule double %B, 127.0
ret i1 %C
}
define i1 @test4(i8 %A) {
; CHECK-LABEL: @test4(
; CHECK-NEXT: [[C:%.*]] = icmp ne i8 [[A:%.*]], 127
; CHECK-NEXT: ret i1 [[C]]
;
%B = sitofp i8 %A to double
%C = fcmp ult double %B, 127.0
ret i1 %C
}
define i32 @test5(i32 %A) {
; CHECK-LABEL: @test5(
; CHECK-NEXT: ret i32 [[A:%.*]]
;
%B = sitofp i32 %A to double
%C = fptosi double %B to i32
%D = uitofp i32 %C to double
%E = fptoui double %D to i32
ret i32 %E
}
define i32 @test6(i32 %A) {
; CHECK-LABEL: @test6(
; CHECK-NEXT: [[ADDCONV:%.*]] = and i32 [[A:%.*]], 39
; CHECK-NEXT: ret i32 [[ADDCONV]]
;
%B = and i32 %A, 7
%C = and i32 %A, 32
%D = sitofp i32 %B to double
%E = sitofp i32 %C to double
%F = fadd double %D, %E
%G = fptosi double %F to i32
ret i32 %G
}
define i32 @test7(i32 %A) {
; CHECK-LABEL: @test7(
; CHECK-NEXT: ret i32 [[A:%.*]]
;
%B = sitofp i32 %A to double
%C = fptoui double %B to i32
ret i32 %C
}
define i32 @test8(i32 %A) {
; CHECK-LABEL: @test8(
; CHECK-NEXT: ret i32 [[A:%.*]]
;
%B = uitofp i32 %A to double
%C = fptosi double %B to i32
ret i32 %C
}
define i32 @test9(i8 %A) {
; CHECK-LABEL: @test9(
; CHECK-NEXT: [[C:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: ret i32 [[C]]
;
%B = sitofp i8 %A to float
%C = fptoui float %B to i32
ret i32 %C
}
define i32 @test10(i8 %A) {
; CHECK-LABEL: @test10(
; CHECK-NEXT: [[C:%.*]] = sext i8 [[A:%.*]] to i32
; CHECK-NEXT: ret i32 [[C]]
;
%B = sitofp i8 %A to float
%C = fptosi float %B to i32
ret i32 %C
}
; If the input value is outside of the range of the output cast, it's
; undefined behavior, so we can assume it fits.
define i8 @test11(i32 %A) {
; CHECK-LABEL: @test11(
; CHECK-NEXT: [[C:%.*]] = trunc i32 [[A:%.*]] to i8
; CHECK-NEXT: ret i8 [[C]]
;
%B = sitofp i32 %A to float
%C = fptosi float %B to i8
ret i8 %C
}
; If the input value is negative, it'll be outside the range of the
; output cast, and thus undefined behavior.
define i32 @test12(i8 %A) {
; CHECK-LABEL: @test12(
; CHECK-NEXT: [[C:%.*]] = zext i8 [[A:%.*]] to i32
; CHECK-NEXT: ret i32 [[C]]
;
%B = sitofp i8 %A to float
%C = fptoui float %B to i32
ret i32 %C
}
; This can't fold because the 25-bit input doesn't fit in the mantissa.
define i32 @test13(i25 %A) {
; CHECK-LABEL: @test13(
; CHECK-NEXT: [[B:%.*]] = uitofp i25 [[A:%.*]] to float
; CHECK-NEXT: [[C:%.*]] = fptoui float [[B]] to i32
; CHECK-NEXT: ret i32 [[C]]
;
%B = uitofp i25 %A to float
%C = fptoui float %B to i32
ret i32 %C
}
; But this one can.
define i32 @test14(i24 %A) {
; CHECK-LABEL: @test14(
; CHECK-NEXT: [[C:%.*]] = zext i24 [[A:%.*]] to i32
; CHECK-NEXT: ret i32 [[C]]
;
%B = uitofp i24 %A to float
%C = fptoui float %B to i32
ret i32 %C
}
; And this one can too.
define i24 @test15(i32 %A) {
; CHECK-LABEL: @test15(
; CHECK-NEXT: [[C:%.*]] = trunc i32 [[A:%.*]] to i24
; CHECK-NEXT: ret i24 [[C]]
;
%B = uitofp i32 %A to float
%C = fptoui float %B to i24
ret i24 %C
}
; This can fold because the 25-bit input is signed and we discard the sign bit.
define i32 @test16(i25 %A) {
; CHECK-LABEL: @test16(
; CHECK-NEXT: [[C:%.*]] = zext i25 [[A:%.*]] to i32
; CHECK-NEXT: ret i32 [[C]]
;
%B = sitofp i25 %A to float
%C = fptoui float %B to i32
ret i32 %C
}
; This can't fold because the 26-bit input won't fit the mantissa
; even after discarding the signed bit.
define i32 @test17(i26 %A) {
; CHECK-LABEL: @test17(
; CHECK-NEXT: [[B:%.*]] = sitofp i26 [[A:%.*]] to float
; CHECK-NEXT: [[C:%.*]] = fptoui float [[B]] to i32
; CHECK-NEXT: ret i32 [[C]]
;
%B = sitofp i26 %A to float
%C = fptoui float %B to i32
ret i32 %C
}
; This can't fold because the 54-bit output is big enough to hold an input
; that was rounded when converted to double.
define i54 @test18(i64 %A) {
; CHECK-LABEL: @test18(
; CHECK-NEXT: [[B:%.*]] = sitofp i64 [[A:%.*]] to double
; CHECK-NEXT: [[C:%.*]] = fptosi double [[B]] to i54
; CHECK-NEXT: ret i54 [[C]]
;
%B = sitofp i64 %A to double
%C = fptosi double %B to i54
ret i54 %C
}
; This can't fold because the 55-bit output won't fit the mantissa
; even after discarding the sign bit.
define i55 @test19(i64 %A) {
; CHECK-LABEL: @test19(
; CHECK-NEXT: [[B:%.*]] = sitofp i64 [[A:%.*]] to double
; CHECK-NEXT: [[C:%.*]] = fptosi double [[B]] to i55
; CHECK-NEXT: ret i55 [[C]]
;
%B = sitofp i64 %A to double
%C = fptosi double %B to i55
ret i55 %C
}
; The mask guarantees that the input is small enough to eliminate the FP casts.
define i25 @masked_input(i25 %A) {
; CHECK-LABEL: @masked_input(
; CHECK-NEXT: [[M:%.*]] = and i25 [[A:%.*]], 65535
; CHECK-NEXT: ret i25 [[M]]
;
%m = and i25 %A, 65535
%B = uitofp i25 %m to float
%C = fptoui float %B to i25
ret i25 %C
}
define i25 @max_masked_input(i25 %A) {
; CHECK-LABEL: @max_masked_input(
; CHECK-NEXT: [[M:%.*]] = and i25 [[A:%.*]], 16777215
; CHECK-NEXT: ret i25 [[M]]
;
%m = and i25 %A, 16777215 ; max intermediate 16777215 (= 1 << 24)-1
%B = uitofp i25 %m to float
%C = fptoui float %B to i25
ret i25 %C
}
define i25 @consider_lowbits_masked_input(i25 %A) {
; CHECK-LABEL: @consider_lowbits_masked_input(
; CHECK-NEXT: [[M:%.*]] = and i25 [[A:%.*]], -16777214
; CHECK-NEXT: ret i25 [[M]]
;
%m = and i25 %A, 16777218 ; Make use of the low zero bits - intermediate 16777218 (= 1 << 24 + 2)
%B = uitofp i25 %m to float
%C = fptoui float %B to i25
ret i25 %C
}
define i32 @overflow_masked_input(i32 %A) {
; CHECK-LABEL: @overflow_masked_input(
; CHECK-NEXT: [[M:%.*]] = and i32 [[A:%.*]], 16777217
; CHECK-NEXT: [[B:%.*]] = uitofp i32 [[M]] to float
; CHECK-NEXT: [[C:%.*]] = fptoui float [[B]] to i32
; CHECK-NEXT: ret i32 [[C]]
;
%m = and i32 %A, 16777217 ; Negative test - intermediate 16777217 (= 1 << 24 + 1)
%B = uitofp i32 %m to float
%C = fptoui float %B to i32
ret i32 %C
}
; Clear the low bit - guarantees that the input is converted to FP without rounding.
define i25 @low_masked_input(i25 %A) {
; CHECK-LABEL: @low_masked_input(
; CHECK-NEXT: [[M:%.*]] = and i25 [[A:%.*]], -2
; CHECK-NEXT: ret i25 [[M]]
;
%m = and i25 %A, -2
%B = uitofp i25 %m to float
%C = fptoui float %B to i25
ret i25 %C
}
; Output is small enough to ensure exact cast (overflow produces poison).
define i11 @s32_half_s11(i32 %x) {
; CHECK-LABEL: @s32_half_s11(
; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X:%.*]] to i11
; CHECK-NEXT: ret i11 [[R]]
;
%h = sitofp i32 %x to half
%r = fptosi half %h to i11
ret i11 %r
}
; Output is small enough to ensure exact cast (overflow produces poison).
define i11 @s32_half_u11(i32 %x) {
; CHECK-LABEL: @s32_half_u11(
; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X:%.*]] to i11
; CHECK-NEXT: ret i11 [[R]]
;
%h = sitofp i32 %x to half
%r = fptoui half %h to i11
ret i11 %r
}
; Output is small enough to ensure exact cast (overflow produces poison).
define i11 @u32_half_s11(i32 %x) {
; CHECK-LABEL: @u32_half_s11(
; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X:%.*]] to i11
; CHECK-NEXT: ret i11 [[R]]
;
%h = uitofp i32 %x to half
%r = fptosi half %h to i11
ret i11 %r
}
; Output is small enough to ensure exact cast (overflow produces poison).
define i11 @u32_half_u11(i32 %x) {
; CHECK-LABEL: @u32_half_u11(
; CHECK-NEXT: [[R:%.*]] = trunc i32 [[X:%.*]] to i11
; CHECK-NEXT: ret i11 [[R]]
;
%h = uitofp i32 %x to half
%r = fptoui half %h to i11
ret i11 %r
}
; Too many bits in output to ensure exact cast.
define i12 @s32_half_s12(i32 %x) {
; CHECK-LABEL: @s32_half_s12(
; CHECK-NEXT: [[H:%.*]] = sitofp i32 [[X:%.*]] to half
; CHECK-NEXT: [[R:%.*]] = fptosi half [[H]] to i12
; CHECK-NEXT: ret i12 [[R]]
;
%h = sitofp i32 %x to half
%r = fptosi half %h to i12
ret i12 %r
}
; Too many bits in output to ensure exact cast.
define i12 @s32_half_u12(i32 %x) {
; CHECK-LABEL: @s32_half_u12(
; CHECK-NEXT: [[H:%.*]] = sitofp i32 [[X:%.*]] to half
; CHECK-NEXT: [[R:%.*]] = fptoui half [[H]] to i12
; CHECK-NEXT: ret i12 [[R]]
;
%h = sitofp i32 %x to half
%r = fptoui half %h to i12
ret i12 %r
}
; TODO: This is safe to convert to trunc.
define i12 @u32_half_s12(i32 %x) {
; CHECK-LABEL: @u32_half_s12(
; CHECK-NEXT: [[H:%.*]] = uitofp i32 [[X:%.*]] to half
; CHECK-NEXT: [[R:%.*]] = fptosi half [[H]] to i12
; CHECK-NEXT: ret i12 [[R]]
;
%h = uitofp i32 %x to half
%r = fptosi half %h to i12
ret i12 %r
}
; Too many bits in output to ensure exact cast.
define i12 @u32_half_u12(i32 %x) {
; CHECK-LABEL: @u32_half_u12(
; CHECK-NEXT: [[H:%.*]] = uitofp i32 [[X:%.*]] to half
; CHECK-NEXT: [[R:%.*]] = fptoui half [[H]] to i12
; CHECK-NEXT: ret i12 [[R]]
;
%h = uitofp i32 %x to half
%r = fptoui half %h to i12
ret i12 %r
}
|
