[PATCH] i386: Fix REDUC_SSE_SMINMAX_MODE mode conditions. [PR94494]

[Uros Bizjak via Gcc-patches]

V4SI, V8HI and V16QI modes of redux_<code>_scal_<mode> expander
expand with SSE2 instructions (PSRLDQ and PCMPGTx) so use
TARGET_SSE2 as relevant mode iterator codition.

2020-04-11  Uroš Bizjak  <ubiz...@gmail.com>

    PR target/94494
    * config/i386/sse.md (REDUC_SSE_SMINMAX_MODE): Use TARGET_SSE2
    condition for V4SI, V8HI and V16QI modes.

testsuite/ChangeLog:

2020-04-11  Uroš Bizjak  <ubiz...@gmail.com>

    PR target/94494
    * gcc.target/i386/pr94494.c: New test.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.

Committed to mainline and gcc-9 branch.

Uros.

diff --git a/gcc/config/i386/sse.md b/gcc/config/i386/sse.md
index fef6065b687..90ced8599ca 100644
--- a/gcc/config/i386/sse.md
+++ b/gcc/config/i386/sse.md
@@ -2733,8 +2733,8 @@
 ;; Modes handled by reduc_sm{in,ax}* patterns.
 (define_mode_iterator REDUC_SSE_SMINMAX_MODE
   [(V4SF "TARGET_SSE") (V2DF "TARGET_SSE")
-   (V2DI "TARGET_SSE4_2") (V4SI "TARGET_SSE") (V8HI "TARGET_SSE")
-   (V16QI "TARGET_SSE")])
+   (V4SI "TARGET_SSE2") (V8HI "TARGET_SSE2") (V16QI "TARGET_SSE2")
+   (V2DI "TARGET_SSE4_2")])
 
 (define_expand "reduc_<code>_scal_<mode>"
   [(smaxmin:REDUC_SSE_SMINMAX_MODE
diff --git a/gcc/testsuite/gcc.target/i386/pr94494.c 
b/gcc/testsuite/gcc.target/i386/pr94494.c
new file mode 100644
index 00000000000..ba0171e59f8
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr94494.c
@@ -0,0 +1,23 @@
+/* PR target/94494 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -ftree-vectorize -msse -mno-sse2" } */
+
+void
+foo (float *item, float *f, float *out,
+     int threshold, int wi, int lo, int hi, int value)
+{
+  for (int i = 0; i < wi; i++) {
+    if (item[i] > 0) {
+      int found = 0;
+
+      for (int k = lo; k < hi; k++)
+        if (f[k] > 0)
+          found = 1;
+
+      if (found > 0)
+        out[i] = threshold;
+      else if (out[i] > value)
+        out[i] -= 1;
+    }
+  }
+}