[CostModel] add tests for math library calls; NFC

This is a partial un-revert of 32dd587 (originally df09f82 ).

I'm adding back the baseline tests first, so we don't have
to back-track as much in case there are still problems.

Author: rotateright

llvm/test/Analysis/CostModel/ARM/intrinsic-cost-kinds.ll

@@ -16,6 +16,9 @@ declare <16 x i32> @llvm.smax.v16i32(<16 x i32>, <16 x i32>)
 declare float @llvm.fmuladd.f32(float, float, float)
 declare <16 x float> @llvm.fmuladd.v16f32(<16 x float>, <16 x float>, <16 x float>)
 
+declare float @llvm.log2.f32(float)
+declare <16 x float> @llvm.log2.v16f32(<16 x float>)
+
 declare i32 @llvm.cttz.i32(i32, i1)
 declare <16 x i32> @llvm.cttz.v16i32(<16 x i32>, i1)
 
@@ -83,6 +86,32 @@ define void @fmuladd(float %a, float %b, float %c, <16 x float> %va, <16 x float
   ret void
 }
 
+define void @log2(float %a, <16 x float> %va) {
+; THRU-LABEL: 'log2'
+; THRU-NEXT:  Cost Model: Found an estimated cost of 10 for instruction: %s = call float @llvm.log2.f32(float %a)
+; THRU-NEXT:  Cost Model: Found an estimated cost of 672 for instruction: %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+; THRU-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: ret void
+;
+; LATE-LABEL: 'log2'
+; LATE-NEXT:  Cost Model: Found an estimated cost of 40 for instruction: %s = call float @llvm.log2.f32(float %a)
+; LATE-NEXT:  Cost Model: Found an estimated cost of 40 for instruction: %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+; LATE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret void
+;
+; SIZE-LABEL: 'log2'
+; SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %s = call float @llvm.log2.f32(float %a)
+; SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+; SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret void
+;
+; SIZE_LATE-LABEL: 'log2'
+; SIZE_LATE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %s = call float @llvm.log2.f32(float %a)
+; SIZE_LATE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+; SIZE_LATE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret void
+;
+  %s = call float @llvm.log2.f32(float %a)
+  %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+  ret void
+}
+
 define void @cttz(i32 %a, <16 x i32> %va) {
 ; THRU-LABEL: 'cttz'
 ; THRU-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %s = call i32 @llvm.cttz.i32(i32 %a, i1 false)

llvm/test/Analysis/CostModel/X86/intrinsic-cost-kinds.ll

@@ -19,6 +19,9 @@ declare <16 x i32> @llvm.smax.v16i32(<16 x i32>, <16 x i32>)
 declare float @llvm.fmuladd.f32(float, float, float)
 declare <16 x float> @llvm.fmuladd.v16f32(<16 x float>, <16 x float>, <16 x float>)
 
+declare float @llvm.log2.f32(float)
+declare <16 x float> @llvm.log2.v16f32(<16 x float>)
+
 declare i32 @llvm.cttz.i32(i32, i1)
 declare <16 x i32> @llvm.cttz.v16i32(<16 x i32>, i1)
 
@@ -114,6 +117,32 @@ define void @fmuladd(float %a, float %b, float %c, <16 x float> %va, <16 x float
   ret void
 }
 
+define void @log2(float %a, <16 x float> %va) {
+; THRU-LABEL: 'log2'
+; THRU-NEXT:  Cost Model: Found an estimated cost of 10 for instruction: %s = call float @llvm.log2.f32(float %a)
+; THRU-NEXT:  Cost Model: Found an estimated cost of 184 for instruction: %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+; THRU-NEXT:  Cost Model: Found an estimated cost of 0 for instruction: ret void
+;
+; LATE-LABEL: 'log2'
+; LATE-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %s = call float @llvm.log2.f32(float %a)
+; LATE-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+; LATE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret void
+;
+; SIZE-LABEL: 'log2'
+; SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %s = call float @llvm.log2.f32(float %a)
+; SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+; SIZE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret void
+;
+; SIZE_LATE-LABEL: 'log2'
+; SIZE_LATE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %s = call float @llvm.log2.f32(float %a)
+; SIZE_LATE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+; SIZE_LATE-NEXT:  Cost Model: Found an estimated cost of 1 for instruction: ret void
+;
+  %s = call float @llvm.log2.f32(float %a)
+  %v = call <16 x float> @llvm.log2.v16f32(<16 x float> %va)
+  ret void
+}
+
 define void @cttz(i32 %a, <16 x i32> %va) {
 ; THRU-LABEL: 'cttz'
 ; THRU-NEXT:  Cost Model: Found an estimated cost of 3 for instruction: %s = call i32 @llvm.cttz.i32(i32 %a, i1 false)