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-rw-r--r--llvm/test/Transforms/InstCombine/fsub.ll127
-rw-r--r--llvm/test/Transforms/InstCombine/known-never-nan.ll11
2 files changed, 138 insertions, 0 deletions
diff --git a/llvm/test/Transforms/InstCombine/fsub.ll b/llvm/test/Transforms/InstCombine/fsub.ll
index 189bc4ca850..33f994da29b 100644
--- a/llvm/test/Transforms/InstCombine/fsub.ll
+++ b/llvm/test/Transforms/InstCombine/fsub.ll
@@ -27,6 +27,18 @@ define float @neg_sub_nsz(float %x, float %y) {
ret float %t2
}
+; FIXME: This combine isn't working.
+define float @unary_neg_sub_nsz(float %x, float %y) {
+; CHECK-LABEL: @unary_neg_sub_nsz(
+; CHECK-NEXT: [[T1:%.*]] = fsub float [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[T2:%.*]] = fneg nsz float [[T1]]
+; CHECK-NEXT: ret float [[T2]]
+;
+ %t1 = fsub float %x, %y
+ %t2 = fneg nsz float %t1
+ ret float %t2
+}
+
; If the subtract has another use, we don't do the transform (even though it
; doesn't increase the IR instruction count) because we assume that fneg is
; easier to analyze and generally cheaper than generic fsub.
@@ -47,6 +59,19 @@ define float @neg_sub_nsz_extra_use(float %x, float %y) {
ret float %t2
}
+define float @unary_neg_sub_nsz_extra_use(float %x, float %y) {
+; CHECK-LABEL: @unary_neg_sub_nsz_extra_use(
+; CHECK-NEXT: [[T1:%.*]] = fsub float [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: [[T2:%.*]] = fneg nsz float [[T1]]
+; CHECK-NEXT: call void @use(float [[T1]])
+; CHECK-NEXT: ret float [[T2]]
+;
+ %t1 = fsub float %x, %y
+ %t2 = fneg nsz float %t1
+ call void @use(float %t1)
+ ret float %t2
+}
+
; With nsz: Z - (X - Y) --> Z + (Y - X)
define float @sub_sub_nsz(float %x, float %y, float %z) {
@@ -140,6 +165,16 @@ define float @neg_op1(float %x, float %y) {
ret float %r
}
+define float @unary_neg_op1(float %x, float %y) {
+; CHECK-LABEL: @unary_neg_op1(
+; CHECK-NEXT: [[R:%.*]] = fadd float [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: ret float [[R]]
+;
+ %negy = fneg float %y
+ %r = fsub float %x, %negy
+ ret float %r
+}
+
define <2 x float> @neg_op1_vec(<2 x float> %x, <2 x float> %y) {
; CHECK-LABEL: @neg_op1_vec(
; CHECK-NEXT: [[R:%.*]] = fadd <2 x float> [[X:%.*]], [[Y:%.*]]
@@ -150,6 +185,16 @@ define <2 x float> @neg_op1_vec(<2 x float> %x, <2 x float> %y) {
ret <2 x float> %r
}
+define <2 x float> @unary_neg_op1_vec(<2 x float> %x, <2 x float> %y) {
+; CHECK-LABEL: @unary_neg_op1_vec(
+; CHECK-NEXT: [[R:%.*]] = fadd <2 x float> [[X:%.*]], [[Y:%.*]]
+; CHECK-NEXT: ret <2 x float> [[R]]
+;
+ %negy = fneg <2 x float> %y
+ %r = fsub <2 x float> %x, %negy
+ ret <2 x float> %r
+}
+
define <2 x float> @neg_op1_vec_undef(<2 x float> %x, <2 x float> %y) {
; CHECK-LABEL: @neg_op1_vec_undef(
; CHECK-NEXT: [[R:%.*]] = fadd <2 x float> [[X:%.*]], [[Y:%.*]]
@@ -174,6 +219,18 @@ define double @neg_ext_op1(float %a, double %b) {
ret double %t3
}
+define double @unary_neg_ext_op1(float %a, double %b) {
+; CHECK-LABEL: @unary_neg_ext_op1(
+; CHECK-NEXT: [[TMP1:%.*]] = fpext float [[A:%.*]] to double
+; CHECK-NEXT: [[T3:%.*]] = fadd double [[TMP1]], [[B:%.*]]
+; CHECK-NEXT: ret double [[T3]]
+;
+ %t1 = fneg float %a
+ %t2 = fpext float %t1 to double
+ %t3 = fsub double %b, %t2
+ ret double %t3
+}
+
; Verify that vectors work too.
define <2 x float> @neg_trunc_op1(<2 x double> %a, <2 x float> %b) {
@@ -188,6 +245,18 @@ define <2 x float> @neg_trunc_op1(<2 x double> %a, <2 x float> %b) {
ret <2 x float> %t3
}
+define <2 x float> @unary_neg_trunc_op1(<2 x double> %a, <2 x float> %b) {
+; CHECK-LABEL: @unary_neg_trunc_op1(
+; CHECK-NEXT: [[TMP1:%.*]] = fptrunc <2 x double> [[A:%.*]] to <2 x float>
+; CHECK-NEXT: [[T3:%.*]] = fadd <2 x float> [[TMP1]], [[B:%.*]]
+; CHECK-NEXT: ret <2 x float> [[T3]]
+;
+ %t1 = fneg <2 x double> %a
+ %t2 = fptrunc <2 x double> %t1 to <2 x float>
+ %t3 = fsub <2 x float> %b, %t2
+ ret <2 x float> %t3
+}
+
; No FMF needed, but they should propagate to the fadd.
define double @neg_ext_op1_fast(float %a, double %b) {
@@ -202,6 +271,18 @@ define double @neg_ext_op1_fast(float %a, double %b) {
ret double %t3
}
+define double @unary_neg_ext_op1_fast(float %a, double %b) {
+; CHECK-LABEL: @unary_neg_ext_op1_fast(
+; CHECK-NEXT: [[TMP1:%.*]] = fpext float [[A:%.*]] to double
+; CHECK-NEXT: [[T3:%.*]] = fadd fast double [[TMP1]], [[B:%.*]]
+; CHECK-NEXT: ret double [[T3]]
+;
+ %t1 = fneg float %a
+ %t2 = fpext float %t1 to double
+ %t3 = fsub fast double %b, %t2
+ ret double %t3
+}
+
; Extra use should prevent the transform.
define float @neg_ext_op1_extra_use(half %a, float %b) {
@@ -219,6 +300,21 @@ define float @neg_ext_op1_extra_use(half %a, float %b) {
ret float %t3
}
+define float @unary_neg_ext_op1_extra_use(half %a, float %b) {
+; CHECK-LABEL: @unary_neg_ext_op1_extra_use(
+; CHECK-NEXT: [[T1:%.*]] = fneg half [[A:%.*]]
+; CHECK-NEXT: [[T2:%.*]] = fpext half [[T1]] to float
+; CHECK-NEXT: [[T3:%.*]] = fsub float [[B:%.*]], [[T2]]
+; CHECK-NEXT: call void @use(float [[T2]])
+; CHECK-NEXT: ret float [[T3]]
+;
+ %t1 = fneg half %a
+ %t2 = fpext half %t1 to float
+ %t3 = fsub float %b, %t2
+ call void @use(float %t2)
+ ret float %t3
+}
+
; One-use fptrunc is always hoisted above fneg, so the corresponding
; multi-use bug for fptrunc isn't visible with a fold starting from
; the last fsub.
@@ -238,6 +334,22 @@ define float @neg_trunc_op1_extra_use(double %a, float %b) {
ret float %t3
}
+; FIXME: This combine isn't working.
+define float @unary_neg_trunc_op1_extra_use(double %a, float %b) {
+; CHECK-LABEL: @unary_neg_trunc_op1_extra_use(
+; CHECK-NEXT: [[T1:%.*]] = fneg double [[A:%.*]]
+; CHECK-NEXT: [[T2:%.*]] = fptrunc double [[T1]] to float
+; CHECK-NEXT: [[T3:%.*]] = fsub float [[B:%.*]], [[T2]]
+; CHECK-NEXT: call void @use(float [[T2]])
+; CHECK-NEXT: ret float [[T3]]
+;
+ %t1 = fneg double %a
+ %t2 = fptrunc double %t1 to float
+ %t3 = fsub float %b, %t2
+ call void @use(float %t2)
+ ret float %t3
+}
+
; Extra uses should prevent the transform.
define float @neg_trunc_op1_extra_uses(double %a, float %b) {
@@ -255,6 +367,21 @@ define float @neg_trunc_op1_extra_uses(double %a, float %b) {
ret float %t3
}
+define float @unary_neg_trunc_op1_extra_uses(double %a, float %b) {
+; CHECK-LABEL: @unary_neg_trunc_op1_extra_uses(
+; CHECK-NEXT: [[T1:%.*]] = fneg double [[A:%.*]]
+; CHECK-NEXT: [[T2:%.*]] = fptrunc double [[T1]] to float
+; CHECK-NEXT: [[T3:%.*]] = fsub float [[B:%.*]], [[T2]]
+; CHECK-NEXT: call void @use2(float [[T2]], double [[T1]])
+; CHECK-NEXT: ret float [[T3]]
+;
+ %t1 = fneg double %a
+ %t2 = fptrunc double %t1 to float
+ %t3 = fsub float %b, %t2
+ call void @use2(float %t2, double %t1)
+ ret float %t3
+}
+
; Don't negate a constant expression to form fadd and induce infinite looping:
; https://bugs.llvm.org/show_bug.cgi?id=37605
diff --git a/llvm/test/Transforms/InstCombine/known-never-nan.ll b/llvm/test/Transforms/InstCombine/known-never-nan.ll
index 23a0780fe43..c5fdc8e800c 100644
--- a/llvm/test/Transforms/InstCombine/known-never-nan.ll
+++ b/llvm/test/Transforms/InstCombine/known-never-nan.ll
@@ -130,6 +130,17 @@ define i1 @nnan_fneg() {
ret i1 %tmp
}
+define i1 @nnan_unary_fneg() {
+; CHECK-LABEL: @nnan_unary_fneg(
+; CHECK-NEXT: [[NNAN:%.*]] = call nnan double @func()
+; CHECK-NEXT: ret i1 true
+;
+ %nnan = call nnan double @func()
+ %op = fneg double %nnan
+ %tmp = fcmp ord double %op, %op
+ ret i1 %tmp
+}
+
define i1 @fpext_maybe_nan(float %arg0) {
; CHECK-LABEL: @fpext_maybe_nan(
; CHECK-NEXT: [[TMP:%.*]] = fcmp ord float [[ARG0:%.*]], 0.000000e+00
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