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[InstCombine] add tests for FP cast of cast; NFC

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A fold of casts is proposed as a backend transform in D79187,
but we can also do that in IR (and that may obsolete the need
for a backend transform).
This commit is contained in:
Sanjay Patel
2020-05-17 11:42:07 -04:00
parent 42011fb1c8
commit 130a2356ae
1 changed files with 55 additions and 0 deletions
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llvm/test/Transforms/InstCombine/fptrunc.ll
+55
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@@ -136,3 +136,58 @@ define float @fptrunc_select_true_val_type_mismatch_fast(half %x, double %y, i1
%r = fptrunc double %sel to float
ret float %r
}
; Convert from integer is exact, so convert directly to float.
define <2 x float> @ItoFtoF_s54_f64_f32(<2 x i54> %i) {
; CHECK-LABEL: @ItoFtoF_s54_f64_f32(
; CHECK-NEXT: [[X:%.*]] = sitofp <2 x i54> [[I:%.*]] to <2 x double>
; CHECK-NEXT: [[R:%.*]] = fptrunc <2 x double> [[X]] to <2 x float>
; CHECK-NEXT: ret <2 x float> [[R]]
;
%x = sitofp <2 x i54> %i to <2 x double>
%r = fptrunc <2 x double> %x to <2 x float>
ret <2 x float> %r
}
; Convert from integer is exact, so convert directly to half.
; Extra use is ok.
define half @ItoFtoF_u24_f32_f16(i24 %i) {
; CHECK-LABEL: @ItoFtoF_u24_f32_f16(
; CHECK-NEXT: [[X:%.*]] = uitofp i24 [[I:%.*]] to float
; CHECK-NEXT: call void @use(float [[X]])
; CHECK-NEXT: [[R:%.*]] = fptrunc float [[X]] to half
; CHECK-NEXT: ret half [[R]]
;
%x = uitofp i24 %i to float
call void @use(float %x)
%r = fptrunc float %x to half
ret half %r
}
; Negative test - intermediate rounding in float type.
define float @ItoFtoF_s55_f64_f32(i55 %i) {
; CHECK-LABEL: @ItoFtoF_s55_f64_f32(
; CHECK-NEXT: [[X:%.*]] = sitofp i55 [[I:%.*]] to double
; CHECK-NEXT: [[R:%.*]] = fptrunc double [[X]] to float
; CHECK-NEXT: ret float [[R]]
;
%x = sitofp i55 %i to double
%r = fptrunc double %x to float
ret float %r
}
; Negative test - intermediate rounding in float type.
define half @ItoFtoF_u25_f32_f16(i25 %i) {
; CHECK-LABEL: @ItoFtoF_u25_f32_f16(
; CHECK-NEXT: [[X:%.*]] = uitofp i25 [[I:%.*]] to float
; CHECK-NEXT: [[R:%.*]] = fptrunc float [[X]] to half
; CHECK-NEXT: ret half [[R]]
;
%x = uitofp i25 %i to float
%r = fptrunc float %x to half
ret half %r
}