[PATCH] D96703: [DAG] foldSubToUSubSat - fold sub(a,trunc(umin(zext(a),b))) -> usubsat(a,trunc(umin(b,c)))

[Pengfei Wang via Phabricator via llvm-commits]

pengfei added inline comments.


================
Comment at: llvm/test/CodeGen/X86/psubus.ll:2668
 ; SSE2:       # %bb.0:
-; SSE2-NEXT:    pxor %xmm7, %xmm7
-; SSE2-NEXT:    movdqa %xmm1, %xmm8
-; SSE2-NEXT:    punpckldq {{.*#+}} xmm8 = xmm8[0],xmm7[0],xmm8[1],xmm7[1]
-; SSE2-NEXT:    movdqa %xmm1, %xmm9
-; SSE2-NEXT:    punpckhdq {{.*#+}} xmm9 = xmm9[2],xmm7[2],xmm9[3],xmm7[3]
-; SSE2-NEXT:    movdqa %xmm0, %xmm10
-; SSE2-NEXT:    punpckldq {{.*#+}} xmm10 = xmm10[0],xmm7[0],xmm10[1],xmm7[1]
-; SSE2-NEXT:    movdqa %xmm0, %xmm11
-; SSE2-NEXT:    punpckhdq {{.*#+}} xmm11 = xmm11[2],xmm7[2],xmm11[3],xmm7[3]
-; SSE2-NEXT:    movdqa {{.*#+}} xmm12 = [9223372039002259456,9223372039002259456]
+; SSE2-NEXT:    movdqa {{.*#+}} xmm9 = [9223372039002259456,9223372039002259456]
 ; SSE2-NEXT:    movdqa %xmm3, %xmm6
----------------
We can use `SSE2-SSE3` now.


Repository:
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https://reviews.llvm.org/D96703